Method of making trimethylene carbonate
US6506909B1 · kind B1 · utility
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5References
37Claims
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Key dates
| Filing date | Dec 20, 2001 |
| Grant date | Jan 14, 2003 |
| Priority date | — |
| Expiry date | Dec 20, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D319/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of synthesizing trimethylene carbonate is disclosed involving(a) reacting 1,3-propanediol and a compound chosen from phosgene and bis-chloroformates to form a polycarbonate intermediate having the structure: wherein n is at least 2; R1 is an end group chosen from H, R3-Cl, R3-OH and —C(O)Cl, where R3 is C1-C6 linear or branched alkyl and R2 is an end group chosen from —OCH2CH2CH2Cl, —OCH2CH2CH2OH and Cl; and(b) providing a combination of temperature and pressure corresponding to vapor phase conditions for trimethylene carbonate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.