The Formation of Linear Polymers from Diene Monomers by the Cyclopolymerization Mechanism. X. Polymers Containing Cyclohexamethylenesilyl and Cycloheptamethylenesilyl Ring Structures

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Abstract
In an effort to determine the feasibility of formation of larger rings from dialkenyl silanes by the cyclopolymerization mechanism through use of Ziegler-type initiators, four new silane monomers were synthesized and their polymerization studied. Allyldimethyl-(3-butene-1)-silane (I) and allyldiphenyl-(3-butene-1)-silane (III) are functionally capable of producing polymers containing a seven-membered ring. Dimethyl-bis-(3-butene-1)-silane (II) and diphenyl-bis-(3-butene-1)-silane (IV) are functionally capable of producing polymers containing an eight-membered ring. The diphenyl monomers gave benzene-soluble, solid polymers containing a low degree of residual unsaturation, interpreted as evidence that the predicted cyclization had occurred. The dimethyl derivatives, on the contrary, gave only viscous oils or semisolid products which could not be well characterized.