An ESR investigation of some paramagnetic species derived from aroylsilanes, aroylgermanes and aroylstannanes

The spin adducts between Group IVB organometallic radicals (MR3, M = Si, Ge, Sn) and benzoyltriphenylsilane, benzoyltriphenylgermane and benzoyltriphenylstannane have been investigated by ESR spectroscopy. Secondary radical species were detected when acetyltrimethylsilane was used, and hteir nature and origin are discussed. The radicals formed upon reduction with alkali alkoxides in polar solvents have also been investigated.