Patent ID: 9359474
Filing Date: 2016-06-07
CPC Classification: B01J,C07F,C08G,C09B

Claim Text:
1. A method for the synthesis of aliphatic polycarbonates comprising the step of contacting an epoxide and carbon dioxide with a metal complex comprising a metal atom coordinated with a salen ligand, the salen ligand comprising two halves, each half coordinated to the metal atom via an imine and an oxygen atom, wherein the metal complex is characterized in that one of the two halves of the salen ligand has two or more cationic activating functional groups tethered to it and the other half has no tethered cationic activating functional groups, wherein the half of the ligand having no tethered cationic activating functional groups comprises or is derived from a gamma dicarbonyl compound.