Process for separating an ar, ar-dihalo-ar-alkylbenzene from an isomeric mixture of ar, ar-dihalo-ar-alkylbenzenes
US4104315A · kind A · utility
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7Claims
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Key dates
| Filing date | Mar 10, 1977 |
| Grant date | Aug 1, 1978 |
| Priority date | — |
| Expiry date | Mar 10, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/269
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In a mixture of isomers of ar,ar-dihalo-ar-alkylbenzene wherein the halogen substituents are meta oriented with respect to each other, (e.g., a mixture of 3,5-dichlorocumene and 2,4-dichlorocumene), the 2,4-dihalo-1-alkylbenzene is preferentially reacted with an alkylating agent, e.g., an alkyl halide, by contacting the mixture with the agent in the presence of a Friedel-Crafts catalyst at a temperature of less than about 90.degree. C. The resulting alkylated isomer is readily separated from the unreacted isomer(s) by simple distillation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.