Formation of 2-cyclohexenones by friedel-crafts acylation of alkenes with β,γ-ethylenic acyl halides
摘要:
Friedel-Crafts acylation of alkenes with beta,gamma-alkenoyl halides leads to conjugated Al-trienolates able to cyclize into Al-enolates of 2-cyclohexenones through an allowed thermal disrotatory electrocyclization mechanism. Discussion of the product structure is based on two-dimensional NMR experiments (400 MHz) and molecular mechanics studies (GENMOL and MM2).
Friedel-Crafts acylation of alkenes with beta,gamma-alkenoyl halides leads to conjugated Al-trienolates able to cyclize into Al-enolates of 2-cyclohexenones through an allowed thermal disrotatory electrocyclization mechanism. Discussion of the product structure is based on two-dimensional NMR experiments (400 MHz) and molecular mechanics studies (GENMOL and MM2).
ORGANIC COMPOUNDS
申请人:Givaudan SA
公开号:EP2155644B1
公开(公告)日:2010-11-17
US3946078A
申请人:——
公开号:US3946078A
公开(公告)日:1976-03-23
[EN] CYCLOALKENYL BUTENONES AND FRAGRANCE COMPOSITIONS COMPRISING THEM<br/>[FR] BUTENONES CYCLOALCÉNYLE ET COMPOSITIONS DE PARFUM LES COMPRENANT
申请人:GIVAUDAN SA
公开号:WO2008071025A1
公开(公告)日:2008-06-19
[EN] The present invention relates to substituted cycloalkenyl butenones of the formula (I) wherein n is 1 to 5; R1 is H, CH3, or C2H5; and the bond between C-2 and C-3 is a single bond and the dotted line together with the bond between C-1 and C-2 represents a double bond; or the bond between C-1 and C-2 is a single bond and the dotted line together with the bond between C-2 and C-3 represents a double bond, and C-1 is optionally substituted with methyl or ethyl. The invention furthermore relates to fragrance compositions comprising them. [FR] L'invention concerne des butenones cycloalcényle substitués de formule (I) dans laquelle n représente 1 à 5; R1 représente H, CH3, ou C2H5; et la liaison entre C-2 et C-3 représente une liaison simple et la ligne en pointillés ainsi que la liaison entre C-1 et C-2 représentent une liaison double; ou la liaison entre C-1 et C-2 représente une liaison simple et la ligne en pointillés ainsi que la liaison entre C-2 et C-3 représentent une liaison double, C1 étant éventuellement substitué par méthyle ou éthyle. L'invention concerne en outre des compositions de parfum les comprenant.