Process for preparing thiophenes

Details Process for preparing thiophenes Process for preparing thiophenes

1977-12-15

1979-03-06

Schwartz, Gerald A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603305, 2603328, C07D33310

Patent

active

041430522

ABSTRACT:
Preparation of a thiophene by the action of H.sub.2 S on an organic substance containing oxygen or sulphur.
The substance which is used is an unsaturated carbonyl or thiocarbonyl compound, particularly an aldehyde, thioaldehyde, ketone or thioketone. The reaction preferably takes place between 250.degree. and 500.degree. C. on a catalyst of the alumina type containing an alkali or alkaline earth oxide.
The process permits the unsubstituted or substituted thiophene to be obtained with high yields and high degrees of selectivity, exceeding 70%.

REFERENCES:
patent: 2558507 (1951-06-01), Appleby et al.
patent: 3822289 (1974-07-01), Clark et al.
patent: 3939179 (1976-02-01), Bell et al.
Hartough, "Thiophene and Its Derivatives," pp. 48-55 (1952).
Chemical Abstracts, vol. 71, column 60, 610(z), (1969).
Chemical Abstracts, vol. 69 column 66,858(s), (1968).
Chemical Abstracts, vol. 51 column 1,039(f).

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