| Abstract: | The polymerization of bis(4‐ethynylphenyl)methylsilane catalyzed by RhI(PPh3)3 afforded a regio‐ and stereoregular hyperbranched polymer, hb‐poly(methylsilylene)bis(1,4‐phenylene‐trans‐vinylene)] (poly( 1 )), containing 95% trans‐vinylene moieties. The weight loss of this polymer at 900°C in N2 was 9%. Poly( 1 ) displayed an absorption due to π‐π* transition around 275 nm as a shoulder and a weak absorption around 330 nm due to π‐to‐σ charge transfer, which was hardly seen in the corresponding linear polymer. |
