Stereochemistry of the thermal isomerizations of (1R,2R)-1-[(E)-styryl]-2-methylcyclopropane to 3-phenyl-4-methylcyclopentenes
作者:John E. Baldwin、Samuel Bonacorsi
DOI:10.1021/ja00076a021
日期:1993.11
(1R,2R)-1-((E)-Styryl)-2-methylcyclopropane at 250 o C racemizes and isomerizes to 6-phenylhexa-1,4-(Z)-diene and to the four isomers of 3-phenyl-4-methylcyclopentene. From the measured rate constants for racemization and for structural isomerizations, and from information on the relative amounts of the four 3-phenyl-4-methylcyclopentenes as a function of time, the relative contributions of the four
(1R,2R)-1-((E)-Styryl)-2-methylcyclopropane 在 250 o C 外消旋并异构化为 6-苯基六-1,4-(Z)-二烯和 3-苯基-的四种异构体4-甲基环戊烯。从外消旋化和结构异构化的测量速率常数,以及四种 3-苯基-4-甲基环戊烯的相对量随时间变化的信息,四种立体化学不同路径对这种乙烯基环丙烷重排的相对贡献是发现为 60% si、10% ar、19% sr 和 11% ai