The anionic polymerization of 2,2,4,4‐tetramethyl‐6,6‐diphenylcyclotrisiloxane (1), its copolymerization with hexamethylcyclotrisiloxane (2), and the homopolymerization of 2 were studied. It was found that the polymerization of 1 initiated with potassium trimethylsilanolate proceeds with the formation of 2,2,4,4,6,6‐hexamethyl‐8,8‐diphenylcyclotetrasiloxane (3). When using lithium butyldimethylsilanolate/HMPT as initiator an inversion of the reactivity order in the homopolymerization of 2 and 1 was observed. The results indicate that both propagation and depropagation occur with a high degree of regioselectivity, which is dependent on the applied catalyst.
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Mazurek et al. (1980) studied this question.
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