SYNTHESIS OF FUNCTIONAL SUBSTITUTED POLYCARBOSILANES BASED ON SILYLTRIFLATE DERIVATIVES

Polycarbosilanes obtained by the Wurtz method or Grignard synthesis we re converted by protodesilylation with trifluoromethanesulfonic acid t o triflate-substituted derivatives. Reactions of these polymeres with nucleophiles led to novel functionally substituted polycarbosilanes. P olycarbosilanes with a regular alternating arrangement of silicon and carbon atoms, however, could not be obtained by this procedure. Such p olymers were prepared by reactions of bis(trifluoromethylsulfonyloxysi lyl) methanes with dinucleophiles. All syntheses are characterized by a high regioselectivity and high yields at low temperatures in short r eaction times. The structures of the polymers were proven by NMR spect roscopy (Si-29, C-13, H-1). (C) 1995 John Wiley and Sons, Inc.