In situ process for preparing quaternary ammonium bicarbonates and quaternary ammonium carbonates
US6989459B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 2004 |
| Grant date | Jan 24, 2006 |
| Priority date | — |
| Expiry date | May 7, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C209/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Applicant has discovered an in situ method of preparing quaternary ammonium methocarbonate salts and quaternary ammonium alkylcarbonate salts in high yield from tertiary amines, methanol, and at least one of a cyclic carbonate, an aliphatic polyester (such as a polycarbonate), or an ester (such as a carbonate ester), and their subsequent conversion to quaternary ammonium bicarbonates, quaternary ammonium carbonates or both in a one-pot reaction. According to one embodiment of the invention, the method includes reacting an amine and methanol with at least one of a cyclic carbonate and an aliphatic polyester to yield a quaternary ammonium methocarbonate. This method does not produce or require the handling of corrosive quaternary ammonium hydroxides. Another embodiment is a method of preparing quaternary ammonium alkylcarbonate salts by reacting tertiary amines, methanol, and an ester. The quaternary ammonium methocarbonate or alkylcarbonate can be converted to the corresponding bicarbonate, carbonate, or mixture thereof by methods known in the art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.