Process for the preparation of 2,3-dihydro-2,2-dimethyl-7-hydroxybenzofurane
US4256647A · kind A · utility
2Cited by
3References
14Claims
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Key dates
| Filing date | Nov 19, 1979 |
| Grant date | Mar 17, 1981 |
| Priority date | — |
| Expiry date | Nov 19, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D307/86
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for the preparation of 2,3-dihydro-2,2-dimethyl-7-hydroxybenzofurane, a carbofuran intermediate, from methallylpyrocatechol comprises heating the methallylpyrocatechol in the presence of water and optionally also in the presence of an inert organic solvent having a boiling point above 70.degree. C., the volume ratio of solvent to water being less than 3, the weight ratio of water to ortho-methallylpyrocatechol being between 0.3 and 5, and at a temperature of preferably 170.degree.-230.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.