Versatile Reactivity of the Germene Mes<sub>2</sub>GeCR<sub>2</sub> toward Esters and Related Carbonyl Derivatives
作者:Sakina Ech-Cherif El Kettani、Mohamed Lazraq、Henri Ranaivonjatovo、Jean Escudié、Heinz Gornitzka、Fatima Ouhsaine
DOI:10.1021/om060917s
日期:2007.7.1
Dimesitylfluorenylidenegermane, Mes2GeCR2 (1; Mes = 2,4,6-trimethylphenyl, CR2 = fluorenylidene), undergoes a [2 + 4] cycloaddition with the CCCO system of α-ethylenic esters such as methyl acrylate, dimethyl maleate and dimethyl fumarate, and diethyl fumarate, leading to the 1,2-oxagerma-5-cyclohexenes 2 and 3a,b, respectively. With diethyl oxalate, maleic anhydride, and cyclopent-2-ene-1,3-dione
Dimesitylfluorenylidenegermane,Mes 2 Ge CR 2(1; Mes = 2,4,6-三甲基苯基,CR 2 =芴基),与α-烯酸酯(例如丙烯酸甲酯)的C CC O体系进行[2 + 4]环加成,马来酸二甲酯和富马酸二甲酯,以及富马酸二乙酯,分别导致1,2-oxagerma-5-cyclohexenes 2和3a,b。与草酸二乙酯,马来酸酐,和环戊-2-烯-1,3-二酮[2 + 2]在Ge之间观察到环加成C双键和羰基官能团,以形成1,2- oxagermetanes 4 - 6, 分别。在最后一种情况下,两个CO基团上的双[2 + 2]环加成反应形成三环化合物,且带有过量的germ烯。Germene 1仅通过烯类反应与2-甲基-1,3-戊二酮反应,生成相应的(锗烷氧基)环戊烯酮8。