A novel and industrial process for preparing cyclopentenone derivatives by heating C.sub.5 .about.C.sub.13 aliphatic acids having one substituent or intramolecular esters thereof in the presence of a solid acid catalyst in a good yield.
A Novel Synthesis of γ,δ-Unsaturated Aldehydes from α-Formyl-γ-lactones
作者:Roger L. Snowden、Robert Brauchli、Simon Linder
DOI:10.1002/hlca.201000447
日期:2011.7
A preparatively useful one‐step transformation of γ,γ‐disubstituted α‐formyl‐γ‐lactones into trisubstituted γ,δ‐unsaturated aldehydes is described, by means of catalytic amounts of either AcOH or AcOEt in the vapor phase over a glass support. A mechanistic rationale is proposed.
[EN] PROCESS FOR THE DIRECT CONVERSION OF LACTONES INTO UNSATURATED KETONES OR ALDEHYDES<br/>[FR] PROCEDE DE CONVERSION DIRECTE DE LACTONES EN CETONES OU ALDEHYDES INSATURES
申请人:FIRMENICH & CIE
公开号:WO2004089861A1
公开(公告)日:2004-10-21
The present invention refers to a process for the preparation of unsaturated ketones or aldehydes by pyrolysis of a lactone, in the presence of a reducing agent such as molecular hydrogen or a carboxylic acid, and in the presence of a catalyst, optionally supported, comprising at least one metal selected from the group consisting of Y, Ti, Cd, Mn, Zn, Sc and Zr.
Process for the direct conversion of lactones into unsaturated ketones or aldehydes
申请人:Naef Ferdinand
公开号:US20060036116A1
公开(公告)日:2006-02-16
The present invention refers to a process for the preparation of unsaturated ketones or aldehydes by pyrolysis of a lactone, in the presence of a reducing agent such as molecular hydrogen or a carboxylic acid, and in the presence of a catalyst, optionally supported, comprising at least one metal selected from the group consisting of Y, Ti, Cd, Mn, Zn, Sc and Zr.
Direct preparation of lanthanoid ester homoenolates from 3-halo esters and lanthanoid metals: their homo-Reformatskii type reaction with carbonyl compounds