The syntheses of 'mixed' polysilanes of molecular weights 1400 less th
an or equal to M(W) less than or equal to 8000 composed of N-methyl-2,
5-pyrrolylene, dimethylsilylene and tetramethyldisilylene units are de
scribed. Poly[(dimethylsilylen)-N-methyl-2,5-pyrrolylene] 3 was prepar
ed from N-methyl-2,5-dibromopyrrole and dimethyldichlorosilane, and y[
(tetramethyldisilylen)-N-methyl-2,5-pyrrolylene] 5 was obtained by Wur
tz polymerization of N-methyl-2,5-bis(dimethylchlorosilyl)pyrrole 4. T
he 'mixed' polysilanes were characterized by size exclusion chromatogr
aphy and by H-1 and Si-29 nuclear magnetic resonance and infra-red spe
ctroscopies. Copyright (C) 1996 Elsevier Science Ltd.