- A 1,5-dihydroxynaphthalene preparation method
-
The invention provides a preparation method of 1,5-dihydroxy naphthalene. The preparation method comprises the following steps: after sulfonation reaction between refined naphthalene and sulfonating agents, salting out to obtain reaction solid and reaction liquid; in the presence of catalysts, heating the reaction solid obtained in the former step, water and inorganic strong alkali to react to obtain1,5-dihydroxy naphthalene, wherein the catalysts are one or more of methanol, ethanol and propanol. The preparation method provided by the invention has the beneficial effects that the reaction temperature in the alkali fusion step in the 1,5-dihydroxy naphthalene production process is reduced, thus reducing the requirements of equipment and reducing the danger coefficient in actual production, so that the reaction conditions are mild and the preparation method is easy to operate.
- -
-
Paragraph 0050
(2017/03/14)
-
- Production of martite nanoparticles with high energy planetary ball milling for heterogeneous Fenton-like process
-
Natural martite microparticles (NMMs) were prepared with a high energy planetary ball mill to form a nanocatalyst for a Fenton-like process. Martite nanoparticles (MNs) of different scales are formed when the milling time ranges from 1 to 5 h at the milling speed of 300 rpm. The catalytic performances of MNs are higher than the NMMs for the degradation of acid blue 5 (AB5) in a heterogeneous Fenton-like process. The NMMs and the MNs were characterized by SEM, EDX, BET, XRD and FT-IR analyses. The size distribution of the 5 h milled martite nanoparticles (MN3) is in the range of 20 nm to 100 nm, and these have the highest surface area (19.23 m2 g-1). The influence of the main operational parameters, including initial pH, MN3 dosage, H2O2 and initial dye concentration, were investigated on the AB5 degradation. The treatment process obeys pseudo first order kinetics and some of the degradation intermediates were recognized by the GC-MS method. The environmentally-friendly production of the MNs, low amount of leached iron and repeated catalyst usage are the significant advantages of this research. Finally, an artificial neural network (ANN) is expanded to estimate the degradation efficiency of AB5 on the basis of the experimental results, which indicates the appropriate performance (R2 = 0.955).
- Rahmani, Amir,Khataee, Alireza,Kaymak, Baris,Vahid, Behrouz,Fathinia, Mehrangiz,Dindarsafa, Mahsa
-
p. 81219 - 81230
(2016/09/09)
-
- Production method of 1,5-dihydroxy naphthlene
-
The invention discloses a production method of 1,5-dihydroxy naphthlene, which is characterized by comprising the following steps: taking the following raw materials in parts by weight: 10 parts of sodium hydroxide and 5-8 parts of sodium 1,5-naphthalene disulfonate with the water content of 3-10%; adding the sodium hydroxide into an alkali fusion reaction kettle, and heating to 260-320 DEG C; slowly and uniformly adding the sodium 1,5-naphthalene disulfonate with the water content of 3-10% while stirring; and hydrolyzing, lowering the temperature in the reaction kettle, slowly acidifying with 40-60% sulfuric acid, adding activated carbon accounting for 2 wt% of the sodium 1,5-naphthalene disulfonate and an inorganic salt catalyst into the reaction solution, and acidifying the filtrate with the rest 50% sulfuric acid until the pH value is 3-6, thereby obtaining the 1,5-dihydroxy naphthlene crude product with the purity of 95-97.8% and the water content of 30-50% and a pressure filtration mother solution. The method has the advantages of high product purity, high product quality, no pollution, recyclable generated mother solution, energy saving and environment friendliness.
- -
-
Paragraph 0023-0030
(2017/03/14)
-
- METHOD FOR PRODUCING PHENOLS
-
PROBLEM TO BE SOLVED: To provide a rational and simple method which improves the yield of phenols by avoiding and suppressing the reaction of formed phenols with a diazonium salt that is an intermediate. SOLUTION: In a method for producing phenols, an aromatic amine compound is diazotized in a diluted sulfuric acid aqueous solution, then the obtained diazonium salt is supplied into a mixed aqueous solution composed of sulfuric acid and an organic compound, that is phase-separated from sulfuric acid, and the phenol formed by hydrolysis is recovered from an organic phase. COPYRIGHT: (C)2015,JPOandINPIT
- -
-
Paragraph 0016; 0020; 0023
(2018/12/12)
-
- An efficient method for demethylation of aryl methyl ethers
-
A new efficient method for demethylation of aryl methyl ethers using iodocyclohexane in DMF under reflux condition is described.
- Zuo, Li,Yao, Shanyan,Wang, Wei,Duan, Wenhu
-
p. 4054 - 4056
(2008/09/20)
-
- Process for functionalising a phenolic compound carrying an electron-donating group
-
The invention concerns a method for functionalizing a phenolic compound bearing an electron-donor group, in said group para position, inter alia a method for the amidoalkylation of a phenolic compound bearing an electron-donor group, and more particularly, a phenolic compound bearing an electron-donor group preferably, in the hydroxyl group ortho position. The method for functionalizing in para position with respect to an electron-donor group carried by a phenolic compound is characterised in that the phenolic compound bearing an electron-donor group is subjected to the following steps: a first step which consists of protecting the hydroxyl group in the form of a sulphonic ester function; a second step which consists in reacting the protected phenolic compound with an electrophilic reagent; optionally, a third step deprotecting the hydroxyl group.
- -
-
-
- Recognition of dihydroxynaphthalenes by a C2-symmetric host
-
A functionalized C2-symmetric host (2) shows high affinity and substrate selectivity for dihydroxynaphthalenes.
- Kim, Hae-Jo,Moon, Dohyun,Lah, Myoung Soo,Hong, Jong-In
-
p. 1887 - 1890
(2007/10/03)
-
- 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.
- -
-
-
- NON-AQUEOUS, LIQUID, ENZYME-CONTAINING COMPOSITIONS
-
A substantially water-free, liquid, enzyme-containing composition comprises: (A) an enzyme; (B) a substance selected from (i) substances which in aqueous medium are substrates for said enzyme, (ii) substances which in aqueous medium are precursors for substrates for said enzyme, and (iii) substances which are cofactors for said enzyme; and (C) a non-aqueous liquid phase.
- -
-
-
- Regioselective hydrolysis of diacetoxynaphthalenes catalyzed by Pseudomonas sp. lipase in an organic solvent
-
Depending on the relative positions of the acetyl groups in the aromatic rings, the Pseudomonas sp. lipase-catalyzed hydrolysis of diacetoxynaphthalenes in tert-butylmethyl ether proceeds regioselectively to afford the corresponding monoacetates.
- Ciuffreda, Pierangela,Casati, Silvana,Santaniello, Enzo
-
p. 317 - 321
(2007/10/03)
-
- Para-hydroxyalkylation of hydroxylated aromatic compounds
-
Hydroxylated aromatic compounds devoid of substituents in the para-position to the hydroxyl group thereof are para-hydroxyalkylated, e.g., into optionally substituted p-hydroxymandelic acid compounds, more particularly p-hydroxymandelic acid and 3-methoxy-p-hydroxymandelic acid, by condensing same with an organic carbonyl compound in the presence of a quaternary ammonium hydroxide.
- -
-
-
- SELECTIVE MONO- OR DIMETALATION OF ARENES BY MEANS OF SUPERBASIC REAGENTS
-
If employed in tetrahydrofuran, stoichiometric amounts of butyllithium and potassium tert-butoxide react with benzene under clean monometalation.In hexane suspension, however, considerable amounts of meta- and para-disubstituted by-products are obtained (approx. 10percent).They become preponderant if a three-fold excess of the metalating agent is used.Naphthalene leads under the same conditions to a mixture of two mono- and ten di-substituted derivatives. - Alkyl groups, as present in tert-butylbenzene, retard the metalation at both m- and p-positions, while trialkylsilyl groups deactivate only m-position.In either case exclusive monosubstitution occurs. - Perdeuterobenzene undergoes metalation and subsequent electrophilic mono- or disubstitution to afford isotope labeled compounds with moderate, though synthetically attractive yields.The kinetic isotope effects and product ratios can be taken as evidence for aggregate formation at the level of both the superbasic metalating reagent and the organometallic intermediates.
- Schlosser, Manfred,Choi, Jung Hoon,Takagishi, Sadahito
-
p. 5633 - 5648
(2007/10/02)
-
- HYDROXYLATION DES NAPHTOLS EN MILIEU SUPERACIDE
-
Hydroxylation of α and β naphtols by hydrogen peroxide in SbF5-HF occurs selectively on the non-phenolic ring, the electrophile reacting on the C-protonated substrate.
- Jacquesy, Jean-Claude,Jouannetaud, Marie-Paule,Morellet, Guy
-
p. 3099 - 3102
(2007/10/02)
-
- Ethylenic silicon compounds and thermoplastic elastomers obtained therefrom
-
The invention provides organosilicon compounds of the formula: STR1 in which: N IS 1, 2 OR 3; Each R, which may be identical or different, is a monovalent organic group which contains a carbon-carbon double bond and from 2 to 10 carbon atoms; Each R1, which may be identical or different, is a straight or branched alkyl radical optionally substituted by one or more halogen atoms or cyano groups; an aryl radical or an alkylaryl radical optionally substituted by one or more halogen atoms; R2 is a straight or branched divalent alkylene or alkylidene radical possessing up to 4 carbon atoms; X is a divalent radical consisting of, or containing, at least one hetero-atom selected from oxygen, sulphur and nitrogen atoms, the radical being attached to the radical R2 via a said hetero-atom; G is an organic radical of valency (m+ l) possess from 1 to 30 carbon atoms; m is 1, 2 or 3; And each Y, which may be identical or different, is a functional group selected from: --NO2, STR2 --COOM (where M represents a sodium, potassium or lithium atom); --COOR4 ; STR3 --COCl; --OH; --OR4 ; STR4 --SH; --SR4 ; STR5 --CONH2 ; --CSNH2 ; --CN; --CH2 --NH2 ; --CHO; STR6 --NCO; STR7 wherein R3 represents a hydrogen atom or a straight or branched alkyl radical possessing up to 6 carbon atoms and R4 represents an alkyl radical possessing up to 4 carbon atoms, with the proviso that two Y groups can together constitute an imide group STR8 wherein R5 represents a hydrogen atom or a straight or branched alkyl radical possessing up to 4 carbon atoms. These are useful intermediates in the preparation of disilanes and silicon polymers, in particular of polyethylenic silicon compounds which can be polymerized with an α, ω-dihydrogenopolysiloxane to give thermoplastic elastomers.
- -
-
-
- Method for preparing adduct of butadiene polymer or copolymer and α, β-ethylenically unsaturated dicarboxylic acid compound
-
In a method for preparing an adduct of (A) a butadiene lower polymer or butadiene lower copolymer and (B) a α,β-ethylenically unsaturated dicarboxylic acid compound, said method is characterized in that said (A) and (B) are caused to react in the presence of one or more compounds selected from (C) p-phenylenediamine derivatives, catechol derivatives, pyrogallol derivatives, N-nitrosamines, quinoline derivatives and naphthol derivatives, thus serious increase of the viscosity of said adduct in the addition reaction can be prevented.
- -
-
-
