Method for preparing diaryl carbonates with improved selectivity
US5760272A · kind A · utility
62Cited by
4References
19Claims
0Family size
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Key dates
| Filing date | Mar 24, 1997 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | Mar 24, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C68/01
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Hydroxyaromatic compounds such as phenol are converted to diaryl carbonates by reaction with oxygen and carbon monoxide in the presence of a catalyst package and an added diluent free from active hydrogen. The preferred catalyst packages comprise a Group VIIIB metal or salt thereof, an inorganic cocatalyst, and organic cocatalysts and a bromide or chloride source. The amount of added diluent is an effective amount to improve selectivity to diaryl carbonate. Preferred diluents are diphenyl carbonate and N-methylpyrrolidone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.