Chemoselectivity in Esterification Reactions – Size Matters after All
作者:Julian Helberg、Marta Marin-Luna、Hendrik Zipse
DOI:10.1055/s-0036-1588854
日期:2017.8
his 70th birthday Abstract The reaction of carboxylic acidchlorides with secondary alcohols carrying either flexible alkyl or rigid aryl substituents was studied through a series of competition experiments. Aliphatic acidchlorides react preferentially with the aryl-substituted alcohols, while acidchlorides derived from aromatic carboxylic acids react with very low selectivity. Catalysis by 9-azajulolidine
The bioimprinting effect in sol‐gel immobilization of lipases was studied to develop efficient novel immobilized biocatalysts with significantly improved properties for biotransformations in continuous‐flow systems. The bioimprinting candidates were selected systematically among the substrate mimics already found in the active site of experimental lipase structures. Four lipases (Lipase AK, Lipase PS
[EN] PROCESS FOR THE PREPARATION OF ACYLATED SECONDARY ALCOHOL ALKOXYLATES AND SECONDARY ALCOHOL ALKOXYLATES<br/>[FR] PROCÉDÉ DE PRÉPARATION D'ALCOXYLATES D'ALCOOLS SECONDAIRES ACYLÉS ET ALCOXYLATES D'ALCOOLS SECONDAIRES
申请人:SHELL INT RESEARCH
公开号:WO2010049465A1
公开(公告)日:2010-05-06
A process for the preparation of acylated secondary alcohol alkoxylates, said process comprising : (i) reaction of one or more internal olefins with one or more carboxylic acids in the presence of a catalyst composition in order to form one or more carboxylic acid esters; (ii) reaction of one or more carboxylic acid esters from step (i) with one or more alkylene oxide reactants, in the presence of a catalytically effective amount of a catalyst composition comprising: (a) one or more alkaline earth metal salts of carboxylic and/or hydroxycarboxylic acids and/or hydrates of the former; (b) an oxy-acid selected from sulphuric acid and ortho-phosphoric acid; (c) an alcohol and/or an ester; and/or products of the reciprocal reactions of (a), (b) and/or (c) in order to form one or more acylated secondary alcohol alkoxylates; and optionally (iii) hydrolysis or transesterification of one or more acylated secondary alcohol alkoxylates from step (ii) in order to form one or more secondary alcohol alkoxylates; and a process for making secondary alcohol alkoxy sulphates comprising the steps of: preparing secondary alcohol alkoxylates by the afore-mentioned process; and sulphating the secondary alcohol alkoxylates.
Continuous process for co-producing linear, secondary, aliphatic alcohols and carboxylic acid esters
申请人:UNION CARBIDE CORPORATION
公开号:EP0129912A1
公开(公告)日:1985-01-02
A continuous process for efficiently co-producing secondary alcohols of long-chain olefins and lower carboxylic acid esters, comprising (I) performing an acid/olefin reaction in the presence of a heterogeneous catalyst such as Amberlyst 15, and (II) performing an ester-exchange reaction in the presence of, e.g., titanium alcoholate. A desirable feature of the process is the ability to produce co-products of choice.