Solvolysis of 2-(ω-alkoxyalkyl)-3-methyl-2-cyclohexenyl p-nitrobenzoates
作者:Mladen Ladika、Branko Juršić、Dionis E. Sunko
DOI:10.1016/s0040-4020(01)89944-0
日期:1987.1
of alkoxy group participation in the solvolysis of allylic p-nitrobenzoates with an ω-alkoxyalkyl side-chain at C-2 center was studied. In 80% EtOH the solvolysisrates, secondary α-deuterium isotope effects, and the product composition show that, contrary to π-participation, neighboring oxygen interacts to a certain degree in the ratedetermining step of solvolysis when a six-membered oxygen-containing
Neighboring sulfur participation in the solvolysis of 2-(ω-alkylthioalkyl)-3-methyl-2-cyclohexenyl p-nitrobenzoates
作者:Mladen Ladika、Branko Juršić、Zlatko Mihalić、Dionis E. Sunko
DOI:10.1016/s0040-4039(00)84352-x
日期:1986.1
As shown by kinetic and product analysis, the solvolysis of and in 97% TFE includes several competitive reactions, one of them being neighboring sulfur participation and formation of intermediate cyclic sulfonium cation.
The rearrangement reaction of alpha,beta-epoxy acylates in cyclic systems was studied. The treatment of cis-derivatives with a Lewis acid afforded rearranged products via the regioselective B-cleavage of the oxirane ring due to the electron-withdrawing nature of the acyloxy group, whereas trans-derivatives enhanced the neighboring group participation to yield only a small amount of rearranged products. This rearrangement reaction proved to be useful for the construction of st variety of spirocyclane systems or quaternary carbon centers on rings and could be applied to their syntheses as optically active forms.
JURSIC, BRANKO;SUNKO, DIONIS E.;LADIKA, MLADEN, TETRAHEDRON, 43,(1987) N 19, 4367-4375