MCM-41-immobilized [Rh(cod)OCH3](2) complex a hybrid catalyst for the polymerization of phenylacetylene and its ring-substituted derivatives

摘要

The immobilization of [Rh(cod)OCH3](2) (cod = cycloocta-1,5-diene) on mesoporous molecular sieves MCM-41 provides the first inorganic-type hybrid catalyst, which affords heterogeneous polymerization of phenylacetylene and its ring-substituted derivatives, - 2-fluorophenylacetylene, 4-fluorophenylacetylene, and 4-pentylphenylacetylene - into readily isolable high-molecular-weight (M-w from 50 000 to 180 000) substituted polyvinylenes of high cis-transoid structure. The activity of this catalyst is compared with that of homogeneous catalyst [Rh(cod)OCH3](2). Yield of polymer (P) and oligomers (O) vs reaction time for the polymerizaition of PhA with Rh/MCM-41 (I), and [Rh (co-d)OMe](2) homogeneous catalyst (2).Conditions. [PhA](0) = 0.6 mol/L [Rh] = 1.5 mmol/L, THF, room temperature. [References: 30]