Halogenative Deoxygenation of Ketones; Vinyl Bromides and/orgem-Dibromides by Cleavage of 1,3-Benzodioxoles (Ketone Phenylene Acetals) with Boron Tribromide
Enzymatic process for the preparation of butyrolactones
申请人:Lonza Ltd
公开号:EP2634180A1
公开(公告)日:2013-09-04
The invention relates to a process for the preparation of a compound of formula
wherein R1 is selected from the group consisting of hydrogen, C2-11-acyl, C4-9-cycloalkanoyl, aryl, aralkyl, aroyl, hetaryl, hetaralkyl and hetaroyl, comprising a biotransformation of a compound of formula
wherein R1 is as defined above, wherein said biotransformation is carried out using a polypeptide having aldo-keto reductase activity or a microorganism containing same.
Thermochemical studies of carbonyl reactions. 2. Steric effects in acetal and ketal hydrolysis
作者:Kenneth B. Wiberg、Robert R. Squires
DOI:10.1021/ja00405a030
日期:1981.7
series of alkyl-substituted dimethyl acetals is reported. These data are critially compared with the enthalpies of hydrolysis from an analogous set of aliphatic dimethyl ketals derived from 2-alkanones. The acetals exhibit a significantly attenuated range in their enthalpies of hydrolysis relative to that for ketal hydrolysis. The free energies of acetalformation in solution were modeled by measurements
Thermodynamics of hydrolysis of aliphatic ketals. An entropy component of steric effects
作者:Kenneth B. Wiberg、Robert R. Squires
DOI:10.1021/ja00513a009
日期:1979.9
The enthalpies and free energies of the acid-catalyzed hydrolysis of a series of a alkyl-substituted dimethyl ketals have been determined in a model study of steric effects. The measured enthalpy differences did not correlate with standardquantitative notions of the steric bulk of the substituents, although the overall free-energy changes fit the expected order. The entropy effect of the substituents
Graphitic carbon nitride catalysed photoacetalization of aldehydes/ketones under ambient conditions
作者:M. Abdullah Khan、Ivo F. Teixeira、Molly M. J. Li、Yusuke Koito、Shik Chi Edman Tsang
DOI:10.1039/c5cc08344c
日期:——
Photoacetalization of aldehydes/ketones with alcohols over graphitic carbon nitride is demonstrated without any acid additive.
将醛/酮与醇在石墨碳氮上进行光氧乙烯化反应,无需任何酸添加剂。
Branched-Selective Intermolecular Ketone α-Alkylation with Unactivated Alkenes via an Enamide Directing Strategy
作者:Dong Xing、Guangbin Dong
DOI:10.1021/jacs.7b08581
日期:2017.10.4
We describe a strategy for intermolecular branched-selective α-alkylation of ketones using simple alkenes as the alkylating agents. Enamides derived from isoindolin-1-one provide an excellent directing template for catalytic activation of ketone α-positions. High branched selectivity is obtained for both aliphatic and aromatic alkenesusing a cationic iridium catalyst. Preliminary mechanistic study