Stereochemistry and mechanism of the reverse ene reaction of cis-2-alkyl-1-alkenylcyclobutanes. Stereoelectronic control in a system showing marginal energetic benefit of concert
作者:Stephen J. Getty、Jerome A. Berson
DOI:10.1021/ja00012a033
日期:1991.6
racemic cyclobutanes (1RS,2RS,1'SR)-1-(1-methoxyethyl)-2-vinylcyclobutane (16b) and (1SR,2SR,1'SR)-1-(1-methoxyethyl)-2-vinylcyclobutane (17b) each undergo a sigmatropic hydrogen shift (reverse ene reaction) amounting to about 18% of the total pyrolysis product, in addition to four other unimolecular processes
在 243.8-267.5 °C 温度范围内,外消旋环丁烷 (1RS,2RS,1'SR)-1-(1-甲氧基乙基)-2-乙烯基环丁烷 (16b) 和 (1SR,2SR,1'SR)-1- (1-甲氧基乙基)-2-乙烯基环丁烷 (17b) 除了四个其他单分子过程外,每个都经历了一个 σ 氢位移(逆烯反应),约占总热解产物的 18%