Preparation of thiophenes

Details Preparation of thiophenes Preparation of thiophenes

1982-06-21

1984-05-08

Raymond, Richard

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

544146, 546212, 546213, 549 61, 549 64, C07D33336

Patent

active

044476248

ABSTRACT:
Process for the preparation of thiophenes having the structure ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 can be various substituents. The compounds can be converted to the corresponding 2-amino compounds from which azo dyes can be prepared.

REFERENCES:
Rajappa et al., Indian J. Chem., vol. 12 (1974), pp. 1-3; vol. 15B (1977), pp. 301-304; vol. 16B (1978), pp. 752-754.

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