Thiophene compounds and the production thereof
US4108865A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1976 |
| Grant date | Aug 22, 1978 |
| Priority date | — |
| Expiry date | Mar 1, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D333/24
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Thiophene compounds of formula: ##STR1## wherein R.sub.1 represents an alkyl radical containing 1 to 4 carbon atoms, a cycloalkyl, cycloalkenyl or aralkyl radical, R.sub.2 represents an atom of hydrogen or a methyl radical with the proviso that when R.sub.2 represents methyl R.sub.1 represents alkyl, or R.sub.1 and R.sub.2, when they are taken together, represent, with the carbon atom to which they are attached, a cyclopolymethylene radical having from 3 to 6 carbon atoms, whereby a reaction medium comprising a solvent and a compound of the general formula: ##STR2## wherein R.sub.3 represents an atom of alkali metal, and R.sub.4 represents an atom of hydrogen or of alkali metal is treated at a temperature between -20.degree. and +80.degree. C with the appropriate quantity of a halide of the general formula: EQU R.sub.5 X III in which X represents an atom of fluorine, chlorine, bromine, or iodine and R.sub.5 represents an alkyl radical containing 1 to 4 carbon atoms, a cycloalkyl, cycloalkenyl or aralkyl radical or the group --CH.sub.2 (CH.sub.2).sub.n X in which n is an integer in the range of from 1 to 4 inclusive and X has the meaning given above with the proviso that when R.sub.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.