Patent ID: 7084237
Filing Date: 2006-08-01
Classification: B01J,C08G

Abstract:
1. In the process of polymerizing heterocyclic compounds, the improvement comprising using a polymerization catalyst of the formula wherein M is tin or germanium; L A is a saturated or unsaturated chain comprising one, two or three elements of group 14 of the Periodic Table, substituted by one member selected from the group consisting of alkyl, cycloalkyl and aryl, each unsubstituted or substituted with a member selected from the group consisting of halogen, alkyl, aryl, nitro and cyano; L′ E E E R E′ R, R′ and R″ are individually selected from the group consisting of hydrogen, alkyl, cycloalkyl, and aryl, unsubstituted or substituted by a member selected from the group consisting of halogen, alkyl, aryl, nitro and cyano.