Erbium(III) triflate is a powerfulcatalyst for the acylation of alcohols and phenols. The reaction works well for a large variety of simple and functionalized substrates by using different kinds of acidicanhydrides Ac2O, (EtCO)2O, [(CH3)3CO]2O, Bz2O, and (CF3CO)2O} without isomerisation of chiral centres. Moreover, the catalyst can be easily recycled and reused without significant loss of activity
is commercially available, is a practical and useful Lewis acidcatalyst for acylation of alcohols with acidanhydrides or the esterification of alcohols by carboxylic acids in the presence of p-nitrobenzoic anhydrides. The remarkably high catalytic activity of scandium triflate can be used for assisting the acylation by acidanhydrides of not only primary alcohols but also sterically-hindered secondary
Erbium(III) Chloride: a Very Active Acylation Catalyst
作者:Renato Dalpozzo、Antonio De Nino、Loredana Maiuolo、Manuela Oliverio、Antonio Procopio、Beatrice Russo、Amedeo Tocci
DOI:10.1071/ch06346
日期:——
Erbium(iii) chloride is a powerfulcatalyst for the acylation of alcohols and phenols. The reaction works well for a large variety of simple and functionalized substrates by using different kinds of acidicanhydrides (Ac2O, (EtCO)2O, (PriCO)2O, (ButCO)2O, and (CF3CO)2), without isomerization of chiral centres. Moreover, the catalyst can be easily recycled and reused without significant loss of activity
Atropisomers and Methods of Altering Enantiomeric Excess
申请人:Florida State University Research Foundation, Inc.
公开号:US20180179120A1
公开(公告)日:2018-06-28
Provided herein are methods of altering enantiomeric excess. The methods may include irradiating an atropisomer that includes at least one chiral substituent to alter the enantiomeric excess of the atropisomer. The at least one chiral substituent may be removed following irradiation.