Mass spectra and stereochemistry of alkylsubstituted 2,2-diphenyl-1,3-dioxa-2-germacyclohexanes

The correlations between electron impact induced formation of fragment M ? C₆H₆]⁺˙ from alkyl-substituted 2,2-diphenyl-1,3-dioxa-2-germacyclohexane (1) and the peculiarities of the molecular structures were found. Benzene elimination is regiospecific and stereoselective, resulting from the abstraction of an axial phenyl group and a hydrogen atom from the C-4 or C-6 position of the ring.