5. Chemistry of 2,3-dihydro-2-metallaphenalenes. Part 1. Synthesis of CHRSiMe2CHR′C10H6(R = R′= H; R = R′= SiMe3; and R,R′= H,SiMe3) and formation of the compound [{Li(Me2NCH2CH2NMe2)}2{CHSiMe2C(SiMe3)C10H6}]via decomposition of [{Li(Me2NCH2CH2NMe2)}2{1,8-(CHSiMe3)2C10H6}]; crystal structures of two polymorphs of the silicon heterocycle dilithium complex Lutz M. Engelhardt,Rocco I. Papasergio,Colin L. Raston,Allan H. White J. Chem. Soc. Dalton Trans. 1984 311