Patent ID: 11904307
Assignee: RAMOT AT TEL-AVIV UNIVERSITY LTD.
Field: Organic fine chemistry (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A process of ring opening polymerization of a cyclic ester, the process comprising contacting the cyclic ester with a catalyst system comprising an organometallic complex represented by Formula I:, , wherein:
the dashed line represents a coordinative bond;
M is a divalent metal;
X is a monoanionic ligand;
A, BA and BB are each independently a bridging moiety of 1 to 12 carbon atoms;
R1 and R2 are each independently hydrogen, alkyl, cycloalkyl, aryl or alternatively, one or both of R1 and R2 form together, optionally with one or more carbon atoms in A, a heteroalicyclic or heteroaromatic, 5-membered, 6-membered or 7-membered ring; and
R3 and R4 are each independently hydrogen, alkyl, cycloalkyl, aryl or alternatively, one or both of R3 and R4 form together with one or more carbon atoms in BB, a heteroalicyclic or heteroaromatic, 5-membered, 6-membered or 7-membered ring, and a co-catalyst.