Reaction of ortho alkenyl- and alkylphenols with 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ)
作者:G. Cardillo、R. Cricchio、L. Merlini
DOI:10.1016/s0040-4020(01)98219-5
日期:1971.1
The reaction of γ,γ-disubstituted ortho α,β-alkenyl, β,γ-alkenyl and alkylphenols with 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) in boiling C6H6 gave 2,2-dialkylchrom-3-enes. Lack of substitution at γ position usually inhibited the reaction. Thymol and 2,6-diisopropylphenol gave nuclear coupling products, whereas the spiropyran IV was obtained from 2-propenylphenol. The remarkable influence of the
γ,γ-二取代邻位α,β-烯基,β,γ-烯基和烷基酚与2,3-二氯-5,6-二氰基苯并醌(DDQ)在沸腾的C 6 H 6中反应生成2,2-二烷基铬- 3-烯。γ位上缺乏取代基通常会抑制反应。百里酚和2,6-二异丙基苯酚产生核偶联产物,而螺吡喃IV由2-丙烯基苯酚获得。在2-异戊基-5-庚基苯酚的情况下,显示出溶剂对反应产物的显着影响。讨论了反应的可能机理。