Evidence for concerted processes in the course of the homoallenylic transposition
作者:Chahinez Aouf、Nicolas Galy、Maurice Santelli
DOI:10.1016/j.tet.2013.02.048
日期:2013.4
The hydrolysis of β-allenic tosylates produces mainly 2-methylenecyclobutanols resulting from a homoallenylic participation along with isomeric 2-methylenecyclobutanol minor products coming from a 1234–1243 rearrangement. Structures of various cyclopropylvinyl carbocations involved in the course of the hydrolysis have been determined by computational studies. For acyclic tosylates, the hydrolysis of
Aliphatic Friedel-Crafts reactions. Part VII. Preparation of αβ- and βγ-unsaturated ketones from substituted cyclohexenes
作者:J. K. Groves、N. Jones
DOI:10.1039/j39680002898
日期:——
The yield of βγ-unsaturatedketone obtained by acylation of 1-methylcyclohexene under various conditions is reported. A series of 1-acyl-2-alkylcyclohexenes has been prepared by base-catalysed isomerisation of some initial acylation products.
[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.
A Mechanistic Dichotomy in Ruthenium-Catalyzed Propargyl Alcohol Reactivity: A Novel Hydrative Diyne Cyclization
作者:Barry M. Trost、Michael T. Rudd
DOI:10.1021/ja036410f
日期:2003.9.1
was tested in the reaction of diynes in the presence of water. Quite excitingly, cyclization comcommittant with addition of water to form 1-acylcycloalkenes occurs. This proves to be general process to form five- and six-membered rings. Interestingly, hydrative cyclization of Z-5-decen-2,8-diyne to 1-acetyl-2-ethyl-cyclohexa-1,4-diene occurs without isomerization of the doublebonds. Furthermore, the