Heterocyclic quaternary ammonium salts as phase transfer catalysts for aromatic ether imide preparation
US4577033A · kind A · utility
7Cited by
4References
10Claims
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Key dates
| Filing date | Jan 14, 1985 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Jan 14, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D209/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Heterocyclic quaternary ammonium salts such as N,N-di-n-butylpiperidinium bromide are excellent phase transfer agents for the preparation of aromatic ethers, as by the reaction of the disodium salt of bisphenol A with 4-nitro-N-methylphthalimide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.