Abstract
The common preparation of polydialkylsilylenes is by the reaction of the corresponding dichlorides with sodium in refluxing toluene. The products are complex, appearing to give three types of polysilylene with different molecular weight regions. It has been shown in the past that the reaction appears to follow addition polymerization lines rather than those of a conventional polycondensation. It is found here, by the reaction of chlorine ended chains, that normal condensations of chlorine ended oligomers play little role in the polymerization. A major product of the polymerization is cyclic polysilanes. It is shown that certain cyclic polysilanes may be polymerized, and the yield of these cyclics may be optimized.
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