Molecular Distributions at Equilibrium. III. Ring—Chain Equilibrium in the Dimethylsilthians

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Abstract
By heating mixtures of cyclic dimethylsilthians with either dichlorodimethylsilane, dimethoxydimethylsilane, or dimethylmercaptodimethylsilane, liquids are formed which are shown to be mixtures of molecules by proton nuclear magnetic resonance. The equilibria resulting from exchange on the dimethylsilicon moiety of bridging sulfur atoms with either chlorine atoms, methoxyl, or methylmercapto groups is shifted strongly towards the ring compounds. At equilibrium, two sizes of rings are seen, with the trimer predominating over the dimer. The appropriate equilibrium constants giving the distribution of chains and of rings and relating the chain distribution to the ring distribution are presented.