Preferential alkylation or acylation of meta-disubstituted benzenes
US4059642A · kind A · utility
4Cited by
1References
11Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 22, 1976 |
| Grant date | Nov 22, 1977 |
| Priority date | — |
| Expiry date | Jul 22, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/269
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In a mixture of isomers of a disubstituted benzene such as dichlorobenzene, the meta-disubstituted isomer is preferentially reacted with an alkylating or acylating agent, e.g., an alkyl halide, by contacting the mixture with the agent in the presence of a Friedel-Craft catalyst at a temperature of less than about 60.degree. C. The resulting alkylated or acylated meta-isomer can be readily separated from the reaction mixture by simple distillation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.