Reactions of Grignard reagents from 1-halogenoallenes. Allenes—XXXIII
作者:P.M. Greaves、S.R. Landor、M.M. Lwanga
DOI:10.1016/0040-4020(75)80150-5
日期:1975.1
Grignard reagents have been prepared from 1-bromo-3,3-dialkylallenes in ether or tetrahydrofuran. The allenic acids, 4,4-dialkylbuta-2,3-dienoic acids together with 4,4-dialkylbut-2-ynoic acids are formed with carbon dioxide to the exclusion of acids with a terminal acetylene group. Two coupled products, 3,4-diethyl-3,4-dimethylhexa-1,5-diyne and 3-ethyl-3,6-dimethylocta-4,5-dien-1-yne, which are formed
格利雅试剂是由在醚或四氢呋喃中的1-溴-3,3-二烷基亚烷基制备的。烯丙酸,4,4-二烷基丁-2,3-二烯酸与4,4-二烷基丁-2-炔酸与二氧化碳一起形成,排除了带有末端乙炔基的酸。两个偶联产物3,4-二乙基-3,4-二甲基六-1,5-二炔和3-乙基-3,6-二甲基辛基-4,5-二烯-1-炔在反应中形成副产物通过使氧通过格氏试剂的溶液,可以高收率获得带有亲电子试剂(CO 2,H 2 O,Me 2 CO)的3-甲基戊-1,2-二烯基溴化镁。