Lead halophenoxides and carbonylation catalyst and method for preparing and employing them
US6310229A · kind A · utility
1Cited by
2References
39Claims
0Family size
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Key dates
| Filing date | Dec 20, 1999 |
| Grant date | Oct 30, 2001 |
| Priority date | — |
| Expiry date | Dec 20, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2531/824
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Lead halophenoxides, especially bromophenoxides, are prepared by the reaction of lead(II) oxides with a hydroxyaromatic compound such as phenol and a chloride or bromide salt such as an alkali metal bromide, a tetraalkylammonium bromide or a bexaalkylguanidinium bromide. They are useful in catalyst compositions for the oxidative carbonylation of hydroxyaromatic compounds to diaryl carbonates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.