<P> Most organotin compounds are colorless liquids or solids that are stable to air and water . They adopt tetrahedral geometry . Tetraalkyl - and tetraaryltin compounds can be prepared using Grignard reagents: </P> <Dl> <Dd> SnCl + 4 RMgBr → R Sn + 4 MgBrCl </Dd> </Dl> <Dd> SnCl + 4 RMgBr → R Sn + 4 MgBrCl </Dd> <P> The mixed halide - alkyls, which are more common and more important commercially than the tetraorgano derivatives, are prepared by redistribution reactions: </P>

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