Varied Reactivity of the Germene Mes2GeCR2 toward Nitriles
摘要:
The germene Mes(2)Ge=CR2 (1, CR2 = fluorenylidene) shows varied behavior toward nitriles. It reacts as a 1,2-dipole with t-BuCN giving a four-membered ring heterocycle, 2-aza-3-germacyclobut-1-ene, as a 1,4-dipole with PhCN, leading to a six-membered ring heterocycle, 3,4-dihydro-3-germaisoquinoline, and as a base, abstracting the alpha-H of R'CH2CN to give alpha-cyanogermanes (R' = H, 2-thienyl, 2-FC6H4, 4-FC6H4).