Synthesis of phenyl substituted cyclohexa-1,4-dienes and cyclohexa-2,5-dienones by anodic methoxylation of alkylbiphenyls
作者:Isidoro Barba、Rafael Chinchilla、Cecilia Gómez
DOI:10.1016/s0040-4020(01)90078-x
日期:1990.1
The anodicmethoxylation of a series of alkylbiphenyls (2-, 3-, 4-methylbiphenyl, 3,3'-, 4,4'-dimethylhiphenyl, 4-ethylhiphenyl and 4,4'-di-tert-butylbiphenyl) carried out under constant current intensity afforded, in a process of two electrons, a number of cis/trans cyclohexa-1,4-dienes and, in a process of four electrons, a number of cyclohexa-2,5-dienones after acidic hydrolysis of the corresponding
Stereoselective two-step chemical preparation of 1,4-dialkyl-1,4-dimethoxycyclohexa-2,5-dienes
作者:Francisco Alonso、Miguel Yus
DOI:10.1016/s0040-4020(01)89749-0
日期:1991.8
phenyllithium) led after hydrolysis with water to the corresponding crude diols 4 which were successively treated with sodium hydride and methyl iodide yielding the expected 1,4-dialkyl-1,4-dimethoxycyclohexa-2,5-dienes 2a-d in a stereoselective manner. The use of a tandem process with two different organolithium reagents followed by methylation by the same procedure yielded stereoselectively the mixed 1-alkyl-4-alkyl'