Ozonolyses of 1-alkyl-substituted 1-tert-butylethylenes and highly methylated methylenecycloalkanes. The influence of the substituent steric bulk on the direction of cleavage of the primary ozonides
作者:Shin-ichi Kawamura、Hideyuki Yamakoshi、Manabu Abe、Araki Masuyama、Masatomo Nojima
DOI:10.1016/s0040-4020(01)01183-8
日期:2002.1
Ozonolyses of 1-alkyl-substituted 1-tert-butylethylenes and of highly methylated methylenecycloalkanes were conducted in the presence of trifluoroacetophenone (7) in ether. The ozonolysis of 2,2,6-trimethyl-1-methylenecyclohexane provided only the crossed-ozonide 10 derived from capture of formaldehyde O-oxide with the ketone 7 in 42% yield, while in the case of the relevant 2,2,5-trimethyl-1-methylenecyclopentane
在醚中在三氟苯乙酮(7)存在下进行1-烷基取代的1-叔丁基乙烯和高度甲基化的亚甲基环烷烃的臭氧分解。2,2,6-三甲基-1-亚甲基环己烷的臭氧分解仅提供了用酮7捕获甲醛O-氧化物而获得的交叉臭氧化物10,产率为42%,而在相关2,2,5的情况下-三甲基-1-亚甲基环戊烷-由2,7,5-三甲基环戊酮O-氧化物与酮7加成环而获得的另一种交叉-臭氧化物15e是唯一可隔离的产品。两种可能的裂环作用过程的用于初级臭氧化物的总能量12C和12E,在B3LYP / 6-31G计算** // B3LYP / 3-21G *水平的理论,似乎重现碎片之间的区域化学所观察到的差异这两个主要的臭氧化物。