Preparation of unsaturated compounds by elimination reaction
US4973751A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1988 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Nov 22, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C41/28
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Compounds of the formula I EQU R.sup.1 --CH.dbd.CH--R.sup.2 I where R.sup.1 is hydrogen or alkyl and R.sup.2 is alkoxy or acylamino, and R.sup.1 and R.sup.2 together may form a heterocyclic ring, are prepared by elimination of the radical R.sup.3 OH from a compound of the formula II ##STR1## where R.sup.1 and R.sup.2 have the above meanings and R.sup.3 is alkyl, by a method in which the elimination is carried out by passing the compound of the formula II in a liquid or gaseous state into a high-boiling mineral oil above the boiling point of compound I being formed, compound I is taken off in gaseous form, and the high-boiling mineral oil enriched with by-products is removed and replaced with fresh mineral oil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.