REACTIONS OF SUBVALENT COMPOUNDS OF SILICON WITH BENZENE AND BIPHENYL

Subvalent species of silicon have been generated by the dehalogenation of dichloro-bis(2,6-dimethyl-piperidino)silane (I), dichloro-bis(diethylamino)silane and dichloro(diisopropylamino)methylsilane (VI) with Na/K alloy in hexane containing benzene or biphenyl. From the reaction mixtures products formed by insertion into CH bonds of the aromatic compounds, have been isolated or detected as the aryl substituted aminosilanes (II, IV, VII-and IX) and the bis(aminosilanyl)phenylenes (V and VIII). Furthermore benzo[d]-1,3-dihydro-1,2,3-trisiloles (III, IX and XII) were formed upon 1,2-substitution of the aromatic rings. Additional products are tris(diethylamino)silane (B) and the 1,3-diphenyltrisilane derivative X. Compounds I, II, III, VI, XI and XII were characterized by their elemental analyses and spectroscopic data (MS, NMR: H-1, C-13, Si-29). CoMpounds IV, V, VII, VIII, IX and X have been detected by MS and in part characterized by NMR and IR data. An X-ray structure analysis has been performed of I.