- Transesterification of α-substituted esters mediated by potassium carbonate
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α-Substituted esters were efficiently and easily transesterificated at room temperature in the presence of potassium carbonate. α-Halo esters can be transesterificated without substitution of the halogen atom.
- Jańczewski, Dominik,Synoradzki, Ludwik,W?ostowski, Marek
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Read Online
- (meth)acrylate compound
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The invention relates to a (meth)acrylate compound as well as a preparation method and application thereof. The compound has the following structure shown in the specification, and the preparation method is simple. The compound has the advantages of low odor or no odor, low irritation or no irritation, low viscosity, high reactivity and moderate glass transition temperature of the obtained polymer, can participate in free radical polymerization, has favorable flexibility and adhesivity, and can be used in light-cured ink, paint and adhesives.
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Paragraph 0041-0043
(2021/03/11)
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- Synthesis of some acyclic quaternary ammonium compounds. Alkylation of secondary and tertiary amines in a two-phase system
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A series of acyclic symmetrical and asymmetrical quaternary ammonium chlorides of the general formula R1R2R3N+AR4Cl- (R1 = Me, Bu; R2 = n-C12H25, PhCH2, C n H2n+1(OCH2CH2) m, n = 9 and 12, m = 1 and 2; R3 = n-C12H25, PhCH2, HOCH2CH2,-OOCCH2; R4 = n-C12H25, PhCH2; A = (CH2CH2O)1,2, CH2C(O)O) was synthesized by the alkylation of tertiary amines in a two-phase system containing water. A convenient method for the synthesis of the initial symmetrical and asymmetrical tertiary amines of the general formula MeNR1R2 (R1 = Me, Bu; R2 = n-C12H25, PhCH2, CnH2n+1(OCH2CH2) m, n = 9 and 12, m = 1 and 2) in an organic phase-aqueous phase heterogeneous system, which allows the use of aqueous solutions of alkali and amines, was developed. The improved method for the preparation of intermediate ethylene glycol and diethylene glycol monoethers is monoalkylation of glycols in dioxane using solid KOH in a two-phase system.
- Kharlamov,Artyushin,Bondarenko
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p. 2445 - 2454
(2015/08/03)
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- Dihaloiodoarenes: α,α-dihalogenation of phenylacetate derivatives
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A hypervalent iodine reagent-based α-carbonyl dihalogenation reaction is reported. Treating diazoacetate derivatives with either iodobenzene dichloride or iodotoluene difluoride results in gem-dichlorination or gem-difluorination products, respectively. The reaction is catalyzed by either Lewis acid or Lewis base activation of the aryl-λ3-iodane (ArIX2) species and proceeds rapidly and chemoselectively to the desired gem-difunctionalized products in good to excellent yield.
- Tao, Jason,Tran, Richard,Murphy, Graham K.
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supporting information
p. 16312 - 16315
(2013/12/04)
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- Direct conversion of N -alkoxyamides to carboxylic esters through tandem nbs-mediated oxidative homocoupling and thermal denitrogenation
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Treatment of N-alkoxyamides with NBS in toluene was found to conveniently afford the corresponding carboxylic esters, including those bearing a bulky or long-chain substituent, in satisfactory to excellent yields. This approach not only represents a convenient and economic approach to a direct transformation of an alkoxyamide moiety into the carboxylic ester functional group, via oxidative homocoupling and the subsequent thermal denitrogenation, but also facilitates the synthesis of sterically hindered carboxylic esters.
- Zhang, Ningning,Yang, Rui,Zhang-Negrerie, Daisy,Du, Yunfei,Zhao, Kang
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p. 8705 - 8711
(2013/09/24)
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- Solvent free, highly chemoselective N and O-acylation on silica and silica magnesium oxide: A recyclable solid surface
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Silica or silica/magnesium oxide mixed surface mediates the N and O-acylation, benzoylation or sulfonylation of hosts of substrates under solvent free conditions at ambient temperature with high chemoselectivity.
- Ghosh, Pranab,Mandal, Amitava
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p. 261 - 268
(2012/10/29)
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- Functionalized biodegradable triclosan monomers and oligomers for controlled release
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This invention relates to the discovery of functionalized triclosan monomers and oligomers that, when incorporated into a substrate of, or applied as part of a coating to, medical devices and/or consumer products may extend the duration of antimicrobial properties to the medical devices and/or consumer products.
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Page/Page column 75-76
(2011/11/13)
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- FUNCTIONALIZED BIODEGRADABLE TRICLOSAN MONOMERS AND OLIGOMERS FOR CONTROLLED RELEASE
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This invention relates to the discovery of functionalized triclosan monomers and oligomers that, when incorporated into a substrate of, or applied as part of a coating to, medical devices and/or consumer products may extend the duration of antimicrobial properties to the medical devices and/or consumer products.
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- Transformation of primary benzyl amines to benzyl esters
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Primary benzyl amines, upon treatment with aq. NaNO2 and appropriate organic acids at 0-5°C, give their respective benzyl esters. Copyright Taylor & Francis, Inc.
- Naik, Ramesh,Pasha
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p. 2823 - 2826
(2007/10/03)
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- Process for the preparation of carboxylic acid benzyl ester
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Carbons?urebenzylester k?nnen durch Umsetzung von Dibenzylether mit Carbons?ureanhydriden in Gegenwart einer oder mehrerer, bevorzugt einer S?ure, gegebenenfalls aufgebracht auf einem oder mehreren, bevorzugt einem, Tr?ger, als Katalysator hergestellt werden.
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- Efficient method for the preparation of carboxylic acid alkyl esters or alkyl phenyl ethers by a new-type of oxidation-reduction condensation using 2,6-dimethyl-1,4-benzoquinone and alkoxydiphenylphosphines
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A new-type of oxidation-reduction condensation proceeded smoothly to afford carboxylic acid alkyl esters or alkyl phenyl ethers in good to high yields by combined use of alkoxydiphenylphosphines (1) having primary, bulky secondary or tertiary alkoxy groups, a mild quinone-type oxidant such as 2,6-dimethyl-1,4-benzoquinone (DMBQ) and carboxylic acids or phenols. Generally, alkoxydiphenylphosphines were prepared easily from chlorodiphenylphosphine (2) and alcohols in the presence of pyridine, and were isolated by distillation. On the other hand, the phosphines 1 were also prepared in situ from N,N-dimethylaminodiphenylphosphine (3a) and primary or secondary alcohols while primary, bulky secondary or tertiary alkoxydiphenylphosphines were alternatively formed in situ by adding 2 to the "BuLi-treated alcohols in order to perform the above reactions by a one-pot procedure from alcohols and nucleophiles. The reaction of thus formed 1, DMBQ and carboxylic acids or phenols afforded the corresponding alkylated products, including hindered secondary and tertiary alkylated ones, in good to high yields at room temperature. In the case of using chiral secondary alcohols, the corresponding carboxylic acid alkyl esters were obtained as well in high yields with perfect inversion of stereochemistry by SN2 replacement.
- Shintou, Taichi,Kikuchi, Wataru,Mukaiyama, Teruaki
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p. 1645 - 1667
(2007/10/03)
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- Preparation of various carboxylic acid esters from bulky alcohols and carboxylic acids by a new type oxidation-reduction condensation using 2,6-dimethyl-1,4-benzoquinone
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A new-type oxidation-reduction condensation by using 2,6-dimethyl-1,4-benzoquinone (DMBQ), carboxylic acids and in situ formed alkoxydiphenylphosphines (1) including the bulky alkoxy group-substituted ones proceeded smoothly to afford the corresponding carboxylic acid esters in good to high yields. Alkoxydiphenylphosphines were formed in situ by treating either N,N-dimethylaminodiphenylphosphine (Ph2PNMe2) with primary or secondary alcohols or chlorodiphenylphosphine with the lithium salts of primary, secondary and tertiary alcohols.
- Mukaiyama, Teruaki,Kikuchi, Wataru,Shintou, Taichi
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p. 300 - 301
(2007/10/03)
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- Catalytic esterification of alcohols, carboxylic acids and transesterification reactions with cerium(IV) triflate
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Esterification reactions of alcohols with acetic, chloroacetic, trifluoroacetic, propionic, stearic, and benzoic acids were catalyzed with Ce(OTf)4 in a solvent or under solvent-free conditions with high yields. The formylation and acetylation of primary and secondary alcohols were also easily achieved in ethyl formate and ethyl acetate. A high retention of the configuration was observed in the acetylation and formylation of (-)-menthol.
- Iranpoor, Nasser,Shekarriz, Marzieh
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p. 455 - 458
(2007/10/03)
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- Kinetics and mechanism of oxidation of aliphatic acetals with peroxomonosulphate
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The oxidation of fifteen aliphatic acetals of normal aliphatic aldehydes and substituted aliphatic aldehydes with aliphatic and substituted aliphatic as well as with aromatic alcohols by peroxomonosulphate in aqueous acetic acid medium is first order each in [oxidant] and [acetal] and yields the corresponding esters as the main product. The oxidation reaction is independent of change in dielectric constant of the medium. The activation enthalpies and entropies of the reactions are linearly related. A mechanism involving hydride ion shift is proposed.
- Janakiram,Venkataraman,Basheer Ahamed
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p. 339 - 341
(2007/10/03)
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- Kinetics and mechanism of oxidation of aliphatic acetals with N-chlorobenzamide
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The oxidation kinetics of thirteen aliphatic acetals of normal aliphatic aldehydes and substituted aliphatic aldehydes with aliphatic and substituted aliphatic as well as with aromatic alcohols by N-chlorobenzamide (NCB) in aqueous acetic acid medium follows first order and zero order dependence in [NCB] and [acetal] respectively and yields the corresponding esters as the main product of oxidation. (H2OCl)+ has been postulated as the oxidizing species.
- Basheer Ahamed
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p. 222 - 224
(2007/10/03)
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- Carboxylic acids supported on silica: A smooth acylating agent for alcohols
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An alternative procedure for the esterification of alcohols by short-chain carboxylic acids supported on silica is presented.
- Da Graca Nascimento, Maria,Zanotto, Sandra Patricia,Scremin, Marivania,Rezende, Marcos Caroli
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p. 2715 - 2721
(2007/10/03)
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