- Electrochemical and nonelectrochemical analyses of cardo polyesters at the metal/0.5?M H2SO4 interface for corrosion protection
-
With the aim of decreasing the corrosion of metal specimens, two polyesters, namely 4-(1-(4-methoxyphenyl)cyclohexyl)phenyl 3-oxobutanoate (MPOB) and 4-(1-(4-methoxyphenyl)cyclohexyl)phenyl 10-oxoundecanoate (MPOU), were synthesized and utilized as corrosion inhibitors. The synthesized polyesters were characterized by Fourier-transform infrared (FT-IR) and nuclear magnetic resonance spectral analyses, followed by thermogravimetric and differential scanning calorimetry analyses. The protective effect of the polyesters on mild-steel specimens in 0.5?M H2SO4 medium was evaluated by nonelectrochemical and electrochemical methods. Gravimetric measurements revealed a decreased corrosion rate with increasing concentration of the inhibitors, reaching a maximum inhibition efficiency of 79.88% for MPOB and 92.98% for MPOU at 1000?ppm concentration at room temperature. The obtained experimental data were best fit by the Langmuir adsorption isotherm, suggesting monolayer adsorption. Thermodynamic parameters supported a physisorption mechanism. Electrochemical impedance spectroscopy showed increased charge-transfer resistance (Rct), in turn decreasing the double-layer capacitance and thereby favoring good inhibition of corrosion of mild steel. Mixed-type inhibition was revealed by potentiodynamic polarization analysis, suppressing anodic metal dissolution and cathodic hydrogen evolution. The mode of adsorption of the inhibitors on the mild-steel surface was additionally evaluated by morphological study using FT-IR and atomic force microscopy (AFM) analyses.
- Unnisa, Chan Basha Nusrath,Chitra, Subramanian,Nirmala Devi, Gowraraju,Kiruthika, Ayyasamy,Roopan, Selvaraj Mohana,Hemapriya, Venkatesan,Chung, Ill-Min,Kim, Seung-Hyun,Prabakaran, Mayakrishnan
-
p. 5425 - 5449
(2019/07/30)
-
- Method for preparing high-purity kerley Bette
-
The invention relates to a preparation method of high-purity clinofibrate, the field of preparation of pharmaceutical compounds. The preparation method comprises the following steps: reacting cyclohexanone and phenol in concentrated hydrochloric acid and glacial acetic acid in a volume ratio of 3:1-7:1 to obtain an intermediate I crude product, decolorizing with a single solvent, and cooling to crystallize to obtain an intermediate I; reacting 2-methylbutyric acid with liquid bromine in phosphorus trichloride, reacting with anhydrous alcohol, extracting, and carrying out vacuum distillation to obtain an intermediate II; reacting the intermediate I and the intermediate II under solventless conditions to obtain an intermediate III; and hydrolyzing the intermediate III and sodium hydroxide, extracting, crystallizing to obtain a clinofibrate crude product; and recrystallizing with an anhydrous solvent to obtain the clinofibrate. The material proportion is adjusted to shorten the production operation period; the invention has the advantages of low energy consumption and low solvent consumption; and the obtained product has the advantages of uniform crystal grains, high purity and low cost.
- -
-
Paragraph 0033; 0034
(2016/10/07)
-
- (METH)ACRYLIC RESIN COMPOSITION, FILM, POLARIZING PLATE PROTECTIVE FILM, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY DEVICE
-
There is provided a (meth)acrylic resin composition containing a (meth)acrylic resin, and a compound denoted by General Formula (1) described below, a film formed by using the (meth)acrylic resin composition, and a polarizing plate and a liquid crystal display device including the film: wherein R1 to R8 each independently represent a hydrogen atom, a halogen atom, a hydroxyl group, or a hydrocarbon group having 1 to 12 carbon atoms, X represents a divalent alicyclic group having 4 to 20 carbon atoms, the alicyclic group represented by X may have at least one substituent group selected from a halogen atom, an aliphatic hydrocarbon group having 1 to 12 carbon atoms, and an aromatic hydrocarbon group having 6 to 15 carbon atoms.
- -
-
Paragraph 0264; 0268
(2017/01/23)
-
- Design of lamellar structured POSS/BPZ polybenzoxazine nanocomposites as a novel class of ultra low-k dielectric materials
-
A novel class of lamellar structured polyhedral oligomeric silsesquioxane/bisphenol Z (POSS/BPZ) polybenzoxazine (PBz) nanocomposites was successfully designed by a facile one-step copolymerization technique. The chemical structures of the monomer and resulting polymer were characterized by Fourier transform infrared (FTIR) spectroscopy, 1H, 13C, DEPT-135, 29Si NMR (nuclear magnetic resonance) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The desired cross-linked lamellae structural arrangement of POSS/BPZ polybenzoxazine (PBz) nanocomposites was confirmed by transmission electron microscopy (TEM). The BPZ-PBz and POSS-PBz layers were self-assembled by intermolecular hydrogen bonding in such a way as to form the lamellar structure during ring opening polymerization. An advantage of this lamellar structure is that 30% POSS/BPZ polybenzoxazine composite exhibits an ultra low-k value of 1.7 at 1 MHz as well as high thermal stability. the Partner Organisations 2014.
- Sasi Kumar,Ariraman,Alagar
-
p. 19127 - 19136
(2014/05/20)
-
- An improved, highly efficient method for the synthesis of bisphenols
-
An efficient synthesis of bisphenols is described by condensation of substituted phenols with corresponding cyclic ketones in presence of cetyltrimethylammonium chloride and 3-mercaptopropionic acid as a catalyst in extremely high purity and yields. Copyright E-Journal of Chemistry 2004-2011.
- Patil,Suryawanshi,Pawar,Shinde
-
experimental part
p. 2016 - 2019
(2012/06/04)
-
- Synthesis, characterization and bioactivity study of cyclic diesters of 4,4'-cyclohexylidene bisphenol
-
Macrocycles 4,4'-cyclohexylidene bisphenyl butan-1,4-dioate,4,4'- cyclohexylidene bisphenyl hexan-1,6-dioate and 4,4'- cyclohexylidenebisphenyldecan- 1,10-dioate have been synthesized by ring closure using high dilution technique. Structures are characterized by physical, analytical and infrared, 1H , 13C NMR and mass spectral data. Compounds showed positive inhibition against gram positive bacteria Staphylococcus aurous.
- Jayamani,Prathipa
-
experimental part
p. 363 - 365
(2011/11/30)
-
- Synthesis, characterization and bioactivity study of cobalt(III) and ruthenium(III) complexes of 4,4′-cyclohexylidene bisphenol
-
Co(III) and Ru(III) complexes of 4,4′-cyclohexylidene bisphenol were synthesized and characterized by physical data, elemental analysis, molar conductance, IR, UV-VIS and TGA studies. Both the ligand and complexes were screened against Staphylococcus aureus and Candida albicans. They showed little activity when compared to standard drug chloramphenicol.
- Jayamani,Kalpana
-
experimental part
p. 4260 - 4262
(2012/03/09)
-
- Synthesis, spectral study and antimicrobial screening of poly(4,4'-cyclohexylidene-R,R'-diphenylene diphosphate)
-
Polyphosphate of l.l-bisfR.RM-hydroxyphenyOcyclohexane (R,R"=H 1CH3and Cl) are synthesized by refluxing bisphenol-c derivative with phosphorous oxytrichloride in pyridiene at 95°C for 4hr and then at 240°C for 6hr. Polyphosphate have been ascertained by IR and NMR spectral data. Polyphosphate are also Characterized by their antibacterial and antifungal activities. The activity is interpreted in light of Wsphenol Structure and the nature of substituent(s).
- Bhadja,Parsania
-
experimental part
p. 1133 - 1139
(2012/04/10)
-
- Synthesis and spectral study of R,R′,4,4′-cyclohexylidene diphenyloxy acetic acids with antimicrobial activity
-
Synthesis of R,R′,4,4′-cyclohexylidene diphenyloxy acetic acids (R,R′=H,CH3and Cl) by dissolving 0.1 mole bisphenols in 0.4 mole sodim hydroxide with drop wise addition of 0.2 mole chloroacetic acid. The reaction mixture refluxed for 4h at 60°C. Phenoxy acids have been confirmed by IR and NMR spectral characterization. The acids are also characterized by their antimicrobial and antifungal activities. The activities have been interpreted in light of bisphenol structures and the nature of substituent(s). The wide scale uses of bisphenol bioactive agents have brought many advantages to the agricultural industries.
- Bhadja,Parsania
-
experimental part
p. 1699 - 1704
(2012/06/15)
-
- COLOR DEVELOPING COMPOSITION CONTAINING MOLECULAR COMPOUND, AND RECORDING MATERIAL
-
Provided is a color-developing composition containing a molecular compound which has as a component compound a compound represented by formula (I) [wherein Y represents a C1-C12 hydrocarbon group which is chained or branched and saturated or unsaturated, or a C1-C8 hydrocarbon group which is chained or branched, saturated or unsaturated and has an ether or thioether bond; R1, R2, R3 and R4 each independently represent a C1-C6 alkyl group or C2-C6 alkenyl group; n, p, q and r each represents any integer of 0 to 4; and m represents any integer of 0 to 2]. Also provided is a recording material with a sufficient color-forming sensitivity, superior storage stability, and especially with an extremely little background fogging in a heat resistance test.
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-
-
- MEDICAL DEVICE USING SULFONATED NEUTRALIZED POLYMERS WITH REDUCED ADHESION OF BIOLOGICAL FLUIDS
-
A medical article having neutralized sulfonic acid groups on its surface, is disclosed. The article has reduced interaction with biological fluids such as insulin, human growth hormone and human serum albumin.
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-
-
- Nanoscale organization of thiol and arylsulfonic acid on silica leads to a highly active and selective bifunctional, heterogeneous catalyst
-
Ordered mesoporous silicas functionalized with alkylsulfonic acid and thiol group pairs have been shown to catalyze the synthesis of bisphenols from the condensation of phenol and various ketones, with activity and selectivity highly dependent on the distance between the acid and thiol. Here, a new route to thiol/sulfonic acid paired catalysts is reported. A bis-silane precursor molecule containing both a disulfide and a sulfonate ester bond is grafted onto the surface of ordered mesoporous silica, SBA-15, followed by simultaneous disulfide reduction and sulfonate ester hydrolysis. The resulting catalyst, containing organized pairs of arylsulfonic acid and thiol groups, is significantly more active than the alkylsulfonic acid/thiol paired catalyst in the synthesis of bisphenol A and Z, and this increase in activity does not lead to a loss of regioselectivity. The paired catalyst has activity similar to that of a randomly bifunctionalized arylsulfonic acid/thiol catalyst in the bisphenol A reaction but exhibits greater activity and selectivity than the randomly bifunctionalized catalyst in the bisphenol Z reaction.
- Margelefsky, Eric L.,Bendjeriou, Anissa,Zeidan, Ryan K.,Dufaud, Veronique,Davis, Mark E.
-
experimental part
p. 13442 - 13449
(2009/02/06)
-
- 3,3-Diphenylpentane skeleton as a steroid skeleton substitute: Novel inhibitors of human 5α-reductase 1
-
We designed and synthesized novel type 1 5α-reductase inhibitors by using 3,3-diphenylpentane skeleton as a substitute for the usual steroid skeleton. 4-(3-(4-(N-Methylacetamido)phenyl)pentan-3-yl)phenyl dibenzylcarbamate (11k) is a competitive 5α-reductase inhibitor with the IC50 value of 0.84 μM.
- Hosoda, Shinnosuke,Hashimoto, Yuichi
-
p. 5414 - 5418
(2008/02/13)
-
- Organized surface functional groups: Cooperative catalysis via thiol/sulfonic acid pairing
-
The synthesis and characterization of heterogeneous catalysts containing surfaces functionalized with discrete pairs of sulfonic acid and thiol groups are reported. A catalyst having acid and thiol groups separated by three carbon atoms is ca. 3 times more active than a material containing randomly distributed acid and thiol groups in the condensation of acetone and phenol to bisphenol A and 14 times more active in the condensation of cyclohexanone and phenol to bisphenol Z. Increasing the acid/thiol distance in the paired materials decreases both the activity and selectivity. This work clearly reveals the importance of nanoscale organization of two disparate functional groups on the surface of heterogeneous catalysts.
- Margelefsky, Eric L.,Zeidan, Ryan K.,Dufaud, Veronique,Davis, Mark E.
-
p. 13691 - 13697
(2008/03/27)
-
- Thermosensitive recording material and color developer compound therefor
-
A thermosensitive recording material has a support and a thermosensitive coloring layer formed thereon containing a leuco dye and a color developer capable of inducing color formation in the leuco dye upon application of heat thereto, with the color developer including at least one compound (A) having in a molecule thereof at least two aromatic ring moieties with specific structures, selected from the group consisting of an aromatic ring moiety having at least one carboxyl group and electron-attracting functional group, an aromatic ring moiety having at least one carboxyl group and electron-donating functional group, and an aromatic ring moiety having at least one carboxyl group, free of the electron-attracting and electron-donating functional groups. An aromatic carboxylic acid compound serving as the above-mentioned compound (A) and the producing method thereof are also disclosed.
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-
- MANUFACTURING METHOD FOR POLYCARBONATE
-
A method for manufacturing polycarbonate by melt-polycondensing bisphenol and carbonic acid diester uses as catalyst an alkali metal compound and/or alkaline earth metal compound (a). The catalyst is added to the bisphenol prior to the melt polycondensation, in an effective amount, i.e., the amount of alkali metal compound and/or alkaline earth metal compound (a) that acts effectively as a catalyst, is contained in said bisphenol, and is controlled to have the same catalytic activity as 1×10?8 to 1×10?6 mole of bisphenol disodium salt per mole of pure bisphenol A. The method conducts the reaction efficiently from the initial stage in a stable manner to obtain polycarbonate with good color, good heat stability and color stability during molding and the like.
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-
-
- Flame retardant thermoplastic resin composition
-
The present invention relates to a flame retardant thermoplastic resin composition that comprises a polycarbonate resin, a rubber modified graft copolymer, a styrene-containing copolymer, an oligomeric phosphoric acid ester morpholide compound as a flame retardant and a fluorinated polyolefin resin. The present invention relates to a polycarbonate thermoplastic resin composition which is superior to the resin composition using oligomeric phosphorus ester in flame retardancy, heat resistance and flexural modulus and superior to the resin composition using monophosphorus ester in the resistance for juicing, heat stability, heat resistance, flexural modulus and appearance.
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-
- Polymer electrolyte and process for producing the same
-
A polymer electrolyte having, in a main chain, a structural unit represented by the following formula (1):-[Ar1-(SO2-N-(X+)-SO2-Ar2)m-SO2-N-(X+)-SO2-Ar1-O]- wherein Ar1 and Ar2 independently represent a divalent aromatic groups, m represents an integer of 0 to 3, and X+ represents an ion selected from hydrogen ion, an alkali metal ion and ammonium ion, which is excellent in proton conductivity, thermal resistance and strength. The polymer electrolyte is soluble in solvents and has excellent film forming property and recycling efficiency.
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-
-
- SLIME REMOVER AND SLIME PREVENTING/REMOVING AGENT
-
A drainage slime remover capable of spreading a solution of a solid over slime generated wall surface portions, comprising a solid containing a microorganism growth retarding substance and a container which has a shape for permitting the installation thereof at the inlet or upper portion of a drain outlet and stores the solid characterized in that the container has drain flow-in holes having an opening capable of controlling a drain flow-in amount and provided in the upper surface or the upper side portion of the container and solution flow-out holes having an opening capable of controlling a flow-out amount of a solid solution and provided in the bottom or the lower side portion of the container or additionally in the side surface thereof, and a slime preventing/removing agent which can remove slime from portions such as kitchen sinks and bathroom drain outlets where slime is grown by metabolites such as miscellaneous germs and mildews and which can prevent the occurrence of slime safely and for an extended period of time.
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- New acrylic esters, derivatives of some diglycidyl ethers as main components of lacquer compositions
-
The synthesis of diacrylate and dimethylacrylate of diglicydyl ethers of bisphenols was studied. Glycidyl ethers were prepared in the reaction of bisphenols with epichlorohydrin in the two phase liquid system including aqueous and organic phase. Acrylic and methacrylic acid were used for the esterification of the diglycidyl ether.
- Podkoscielny,Bartnicki
-
-
- Method for manufacturing bisphenol
-
A method for manufacturing bisphenol by reacting phenols and ketones, characterized (1) in that an alkali metal compound and/or alkaline earth metal compound is added to bisphenol obtained by reacting a phenol and a ketone, and (2) in that the basicity of the bisphenol is adjusted so as to be equivalent to an amount of 1 × 10-8to 1 × 10-6moles of bisphenol as disodium salt with respect to 1 mole of bisphenol provides a bisphenol in which there is no residue of the organic catalysts ordinarily used in manufacturing bisphenol, so that byproducts are not produced during purification, allowing bisphenol with outstanding color tone, thermal resistance, etc., to be obtained.
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- Process for the purification of bisphenols and preparation of polycarbonates therefrom
-
A phenol and a ketone are reacted to form bisphenol, and the liquid bisphenol obtained or a mixed solution of said solution and a phenol is filtered through a calcined metal filter to obtain bisphenol which makes it possible to efficiently obtain bisphenol which either does not contain fine particulate impurities or contains such impurities only in minute amounts, and a method for manufacturing polycarbonate using bisphenol obtained bythis method. The filtration grade of the calcined metal filter should be 1.0 μm or less. After filtering, the calcined metal filter can be backwashed or chemically washed and then reused. The bisphenol should preferably be bisphenol A.
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-
- Bisphosphine oxide monomers
-
Bisphosphine oxide monomers and homologs thereof may be incorporated into polycarbonates in order to obtain a flame retardant polymer. More particularly, bis[2,5-(diphenylphosphine oxide)]-1,4-hydroquinone and homologs thereof may be used to prepare flame retardant polycarbonates that retain high glass transition temperature and high impact resistances.
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-
- Salicylic acid derivatives
-
The heat-sensitive recording material disclosed comprises a colorless or pale colored dyestuff precursor, one or more salicylic acid derivative of the formula (1) or metal salt of the derivative and an aliphatic amide compound having 18?60 carbon atoms in molecular structure, and is excellent in thermal response and preservation stability of white portions and images. STR1 wherein X1 and X2 are a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aralkyl group or an aryl group, Y1 and Y2 are an oxygen atom or a sulfur atom, R1 is a hydrogen atom, an alkyl group, an aralkyl group or an aryl group, and R2 is an alkyl group, an alkenyl group, an aralkyl group or an aryl group.
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-
- Clathrate composition including essential oils and method of using same
-
A composition for killing harmful organisms, which contains a clathrate compound composed of one or more natural essential oils and/or derivatives thereof selected from the group consisting of the following substances (1) to (22) and a polymolecular host compound capable of including the natural essential oils and/or derivatives thereof: (1) hinoki oil; (2) 1,8-cineole; (3) l-α-terpineole; l-carbone; (5) l-menthone; (6) d-pulegone; (7) citronellal; (8) linelool oxide; (9) d,l-citronellol; (10) 3,3,5-trimethylcyclohexanol; (11) l-perillaldehyde; (12) l-carveol; (13) myrtenal; (14) peppermint oil; (15) eucalyptus oil; (16) cinnamic aldehyde; (17) α-bromo-cinnamic aldehyde; (18) salicylaldehyde; (19) benzaldehyde; (20) paraphenyl-propionaldehyde; (21) paratolualdehyde; and (22) l-menthol.
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- Phenolic compounds
-
A phenolic compound having formula (I): STR1 wherein X represents a chlorine atom or a methyl group, and a recording material comprising a coloress or light-colored leuco dye and the above phenolic compound serving as a color developer for the leuco dye are disclosed.
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- Method for preparing aromatic bischloroformate compositions
-
Bischloroformate oligomer compositions are prepared by passing phosgene into a heterogeneous aqueous-organic mixture containing at least one dihydroxyaromatic compound, with simultaneous introduction of a base at a rate to maintain a specific pH range and to produce a specific volume ratio of aqueous to organic phase. By this method, it is possible to employ a minimum amount of phosgene. The reaction may be conducted batchwise or continuously. The bischloroformate composition may be employed for the preparation of cyclic polycarbonate oligomers or linear polycarbonate, and linear polycarbonate formation may be integrated with bischloroformate composition formation in a batch or continuous process.
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- Carbonates of acetylenic alcohols
-
Polymerizable carbonate compounds of the formula: wherein A is an aromatic polycycle, R1 and R2 are independently hydrogen atom or alkyl, and n is 1, 2 or 3, are disclosed. They are useful as a component of nonemanating, self-curing and heat resistant resin compositions.
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- Bischoloroformate preparation method with phosgene removal and monochloroformate conversion
-
Aqueous bischloroformates are prepared by the reaction of a dihydroxyaromatic compound (e.g., bisphenol A) with phosgene in a substantially inert organic liquid (e.g., methylene chloride) and in the presence of an aqueous alkali metal or alkaline earth metal base, at a pH below about 8. After all solid dihydroxyaromatic compound has been consumed, the pH is raised to a higher value in the range of about 7-12, preferably 9-11, and maintained in said range until a major proportion of the unreacted phosgene has been hydrolyzed. At the same time, any monochloroformate in the product may be converted to bischloroformate.
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- Method of purifying a microbicide
-
A clathrate compound is produced if a powdery host compound which reacts with a microbicide to form the clathrate compound is added into an aqueous solution of the microbicide. If the microbicide is separated from the clathrate compound, a microbicide of high purity can be obtained.
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-
- Cyclic monocarbonate bishaloformates
-
Cyclic monocarbonate bischloroformates are prepared by the reaction of a carbonyl halide such as phosgene with a bridged substituted resorcinol or hydroquinone such as bis(2,4-dihydroxy-3-methylphenyl)methane or bis(2,5-dihydroxy-3,4,6-trimethylphenyl)methane in the presence of aqueous alkali metal hydroxide. The cyclic monocarbonate bischloroformates may be used for the preparation of linear or cyclic polycarbonates containing cyclic carbonate structural units, which may in turn be converted to crosslinked polycarbonates.
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- Processes for bisphenols
-
A process for the preparation of gem-bis(hydroxyaryl)alkanes which comprises the reaction of a ketone, a hydroxyarene and an alkylhalosilane.
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-
- Polyetherimide bisphenol compositions
-
Polyetherimide bisphenols and bischloroformates are prepared by the reaction of dianhydrides or certain bisimides with aminophenols or mixtures thereof with diamines. They are useful as intermediates for the preparation of cyclic heterocarbonates, which may in turn be converted to linear copolycarbonates. The bisphenols can also be converted to salts which react with cyclic polycarbonate oligomers to form block copolyetherimidecarbonates.
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-
- A Convenient Method for the Preparation of Bisphenols
-
Synthesis of two bisphenols having a "cardo' group was carried out from phenol and o-cresol using cyclohexanone and a mixture of hydrochloric acid and acetic acid in the ratio 2:1 (v/v) at different temperatures to optimise the condition.The products have been characterised bu ir, 1H nmr and 13C nmr spectra.
- Rao, M. Venkateswara,Rojivadiya, A. J.,Parsania, P. H.,Parekh, H. H.
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p. 758 - 759
(2007/10/02)
-
- Polycarbonates exhibiting improved heat resistance
-
Novel heat resistant polycarbonates are provided which are the polymerized reaction products of: (i) a carbonate precursor; and (ii) at least one dihydric phenol selected from dihydric phenols represented by the general formulae STR1 wherein: each R1 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals; each R2 is independently selected from halogen radicals, monovalent hydrocarbon radicals, and monovalent hydrocarbonoxy radicals; R4 and R5 are independently selected from monovalent hydrocarbon radicals; R3 is selected from hydrogen and monovalent hydrocarbon radicals, with the proviso that if R3 is a hydrogen radical than at least one of the monovalent hydrocarbon radicals represented by R4 and R5 contains at least two carbon atoms; R7 is selected from hydrogen and monovalent hydrocarbon radicals; R6 is a divalent hydrocarbon radicals; and n and n' are independently selected from whole numbers having a value of from 0 to 4 inclusive.
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- Process for the preparation of bisphenols
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Processes for the preparation of bisphenols from phenols and substituted vicinal glycols, or unsaturated alcohols or substituted dienes resulting in bisphenols represented by the general formula: STR1 wherein: R1 and R2 are independently selected from monovalent hydrocarbon and monovalent hydrocarbonoxy radicals of one to four carbon atoms, or from halogen radicals; R3, R4 and R5 is each a lower alkyl radical, preferably of one to four carbon atoms, aryl radicals, alkaryl radicals, aralkyl radicals, and cycloalkyl radicals, and is the same or different; R5 may also be hydrogen. n and n1 are independently selected from whole numbers having a value of from 0 to 4 inclusive.
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- Dihydric phenols
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Novel polycarbonates are provided which exhibit rubbery and elastomeric properties which are the polymerized reaction products of: (i) a carbonate precursor; and (ii) at least one dihydric phenol represented by the general formula STR1 wherein R is selected from straight chain alkyl radicals containing from 8 to about 30 carbon atoms; each R1 is independently selected from halogen monovalent hydrocarbon, and monovalent hydrocarbonoxy radicals; each R2 is independently selected from halogen, monovalent hydrocarbon, and monovalent hydrocarbonoxy radicals; and n and n' are independently selected from whole numbers having a value of from 0 to 4 inclusive.
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-
- REACTION OF PHENOL WITH CYCLOHEXANONE IN THE PRESENCE OF ALUMINUM PHENOLATE
-
The reaction of phenol with cyclohexanone in the presence of aluminum phenolate leads to a mixture of products of ether and phenolic character and also a mixture of the dimer and trimer of the initial ketone.As a rule 1-(2-hydroxyphenyl)cyclohexene predominates in the mixture.
- Kozlikovskii, Ya. B.,Chernyaev, B. V.
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p. 1970 - 1973
(2007/10/02)
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- Process for preparing hydroquinone and acetone
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A process is provided for the preparation of hydroquinone by oxidizing a phenol having in the paraposition a 1-cycloalkenyl or α-methylene-(alkyl or aralkyl) group. The oxidation is carried out using hydrogen peroxide or a hydrocarbyl peroxide in the presence of an inert solvent and a catalytic amount of a strong acid which is not oxidized by the peroxide. The other product of the reaction is the ketone derived by oxidation of the para-substituent in the starting phenol, e.g. p-isopropenylphenol gives hydroquinone and acetone. The reaction forms a particularly convenient route for conversion of phenol to hydroquinone in that phenol is condensed with acetone to bisphenol A, the latter is degraded by alkaline hydrolysis to a mixture of phenol and p-isopropenylphenol, which latter is subjected, without separation, to the above process to give a mixture of hydroquinone, phenol, and acetone. The acetone and phenol are recovered and used in the preparation of bisphenol A thereby starting a new cycle of conversion.
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- Process for producing bisphenols
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Bisphenols, substantially free of by-products, are produced rapidly by reacting a phenol and a compound of the formula STR1 wherein R and R' are independently selected from the group consisting of hydrogen, lower alkyl or aryl; X is lower acyloxy; Y is lower alkoxy, aryloxy or the same as X; Z is the divalent radical STR2 wherein R" and R'" are selected from the same category as R and R', and n is an integer from 3 to 9; m=(n-1).
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- Labelling of a new hypolipaemic agent with carbon 14, preparation of 1,1 bis[4 (1 carboxy 1 methylpropoxy)phenyl]cyclohexane 2 14C
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1,1 Bis[4 (1 carboxy 1 methylpropoxy)phenyl] cyclohexane (S 8527) (I), a new hypolipemic agent, was labelled as C 2 with carbon 14 for the use of metabolic studies. Cyclohexane 2 14C which was prepared from potassium cyanide 14C was condensed with phenol to produce 1,1 bis(4 hydroxyphenyl)cyclohexane 2 14C (VI). Condensation of VI with ethyl methyl ketone and chloroform under a strong base (potassium hydroxide) gave S 8527 2 14C (I). A total of 3.11 mCi of pure S 8527 2 14C (I) was obtained, representing a 12% radiochemical yield from potassium cyanide 14C. Furthermore, a new radioactive by product was isolated and elucidated its structure as X.
- Yoshitake,Makari,Kawahara,Doi
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p. 247 - 257
(2007/10/05)
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