Condensation methods of epoxides with cyclic anhydride in the presence of titanium nitrogen complex base catalyst

摘要

Process for the condensation of at least one epoxide with at least one cyclic anhydride of a dicarboxylic acid in the presence of a catalyst based on at least one nitrogen-containing titanium complex of formula (I) Ti(OR1)m(OR2)n(OR3)pLq in which each of R1, R2 and R3 independently of each other represents a hydrocarbon group, L represents the residue of a nitrogen-containing compound, the sum m + n + p + q is 4, q is an integer from 1 to 4 and m, n and p are each, independently of each other, 0 or 1. …??The said process permits production of a perfectly alternating polyester. …IMAGE…