Process for preparing 2-amino-thiophenes and azo dyestuffs prepa

Details Process for preparing 2-amino-thiophenes and azo dyestuffs prepa Process for preparing 2-amino-thiophenes and azo dyestuffs prepa

1987-10-15

1989-12-19

Higel, Floyd D.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

534573, 534768, 534787, 549 55, 558388, 558408, C07C15300, C07C153063, C07D33300, C07D33368

Patent

active

048884324

ABSTRACT:
2-Aminothiophenes of the formula ##STR1## wherein R=substituent and n=0-4, are prepared by dehydrogenating ring closure of thioamides of the formula ##STR2## The 2-aminothiophenes are useful for preparing useful azo dyestuffs. A process for preparing a compound of the formula ##STR3## comprising reacting a compound of the formula ##STR4## in which R and n have the abovementioned meanings with a compound of the formula ##STR5## in which T denotes NH.sub.2, aryl or alkyl, in the presence of an acid. An azo dyestuff of the formula ##STR6## in which V denotes Cl, Br or CF.sub.3,

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Beck et al., J. Org. Chem., vol. 39, pp. 3440-3441, (1974).
Gewald et al., Ber. Deut. Chem. Gesell., vol. 101, pp. 1933-1939, (1968).
Pallos et al., Chemical Abstracts, vol. 78, #29282q, (1973).
Chemische Berichte, Band 101, No. 6, 1968, Seiten 1933-1939, Verlag Chemie GmbH, Wwinheim, DE; K. Gewald et al.: "2-Amino-thionaphthene".

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