Patent ID: 6506909
Filing Date: 2003-01-14
Classification: C07D

Abstract:
A method of synthesizing trimethylene carbonate comprising the steps of:(a) reacting 1,3-propanediol and a compound selected from the group consisting of phosgene and bis-chloroformates to form a polycarbonate intermediate having the structure: â€ƒwherein n is at least 2; R1 is an end group selected from the group consisting of H, R3â€”Cl, R3â€”OH and â€”C(O)Cl, where R3 is C1-C6 linear or branched alkyl and R2 is an end group selected from the group consisting of â€”OCH2CH2CH2Cl, â€”OCH2CH2CH2OH and Cl; and (b) providing a combination of temperature and pressure corresponding to vapor phase conditions for trimethylene carbonate.