The present invention provides a fragrance precursor of formula I:
1
that is capable of forming a fragrant ketone of formula II:
2
and a fragrant lactone of formula III:
3
Process for converting .alpha.-acyl-substituted lactones to
申请人:Henkel Corporation
公开号:US05416224A1
公开(公告)日:1995-05-16
A convenient stereoselective process for the preparation of .alpha.-alkylidene-substituted-.gamma.-butyrolactones and .delta.-valerolactones is provided. The process involves reacting an .alpha.-acyl lactone, an aldehyde, and an alkali metal hydroxide in an inert diluent at an elevated temperature while removing water.
Improved process for the preparation of substituted furanones
申请人:QUANTUM CHEMICAL CORPORATION (a Virginia corp.)
公开号:EP0348549A1
公开(公告)日:1990-01-03
This invention relates to an improved process for the preparation of 3-acyl-5-alkyldihydro-2(3H)-furanones according to the following reaction scheme:
wherein R and R1 are hydrogen or alkyl and R2 is a hydrocarbon or -0-hydrocarbon radical of from 1 to 20 carbon atoms and X is a leaving group.
Process for the preparation of .alpha.-alkyl lactones
申请人:Henkel Corporation
公开号:US04980342A1
公开(公告)日:1990-12-25
A convenient process for the preparation of .gamma.-alkyl-substituted-.gamma.-butyrolactones and .delta.-valerolactones is provided. The process involves forming the .alpha.-alkylidene lactone by reacting essentially equimolar amounts of an .alpha.-acyl lactone, an aldehyde, and an alkali metal hydroxide in an inert diluent at an elevated temperature while removing water and hydrogenating the .alpha.-alkylidene lactone to obtain the corresponding .alpha.-alkyl lactone.
Process for the preparation of alpha-alkyl lactones
申请人:Henkel Corporation
公开号:US05231192A1
公开(公告)日:1993-07-27
Process for the preparation of .alpha.-alkyl lactones by the steps of first reacting an .alpha.-acyl lactone, an aldehyde, and an alkali metal hydroxide together to form an .alpha.-alkylidene lactone, and then hydrogenating the .alpha.-alkylidene lactone.