Method for the cyclization of gamma-delta, or delta-epsilon unsaturated alcohols
US4284567A · kind A · utility
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12Claims
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Key dates
| Filing date | Oct 4, 1979 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | Oct 4, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D307/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In the cyclization of gamma-delta or delta-epsilon unsaturated alcohols in order to obtain certain tetrahydrofuran and tetrahydropyran derivatives which are useful in the perfuming of detergents, the improvement consisting in that the alcohol to be cyclized is reacted with a cationic ion-exchange resin. The useful temperature range is from 20.degree. C. to 150.degree. C.: in practice the alcohol and the resin are boiled together or refluxed until the reaction is completed. A number of examples is reported and physicochemical data are given.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.