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Functionalized 1,3-disilacyclobutanes (RSiX-CH 2 ) 2  have been prepared by protodesilylation of aminosubstituted 1,3-disilacyclobutanes with triflic acid and by conversions with nucleo­ philes. The ring-opening polymerisations of these compounds lead to novel high molecular weight poly(silylenemethylenes), which are characterized by a linear structure and alternating silicon and carbon atoms in the main chain. The hydrosilylation reaction between the poly(silylenemethylenes) (RSiH-CH 2 ) n  and (RSiVi-CH 2 ) n  results in a polymer network which may serve as an interesting preceramic material. The structures of the polymers were proven by NMR spectroscopy ( 29 Si,  13 C,  1 H).

Funktionalisierung und Vernetzung von Poly(silylenmethylenen) Functionalization and Cross-Linking of Poly(silylenemethylenes)