Process for the preparation of nitroanilines

Details Process for the preparation of nitroanilines Process for the preparation of nitroanilines

1986-01-17

1990-11-27

Hines, Robert V.

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

Organic compounds

Amino nitrogen containing

564346, 564367, 564413, 564441, C07C21100, C07C20900

Patent

active

049737570

ABSTRACT:
The invention relates to a process for the preparation of nitroanilines, which consists in reacting an amine RNH.sub.2, or ammonia, with 3,4-methylenedioxynitriobenzene to give the products of the formula: ##STR1## in which R denotes hydrogen, alkyl, monohydroxyalkyl or polyhydroxyalkyl, alkoxyalkyl or aminoalkyl of the formula: ##STR2## in which R.sub.1 and R.sub.2, which are identical or different, denote hydrogen, alkyl or monohydroxyalkyl or polyhydroxyalkyl and n denotes an integer from 2 to 4, or of the formula: ##STR3## in which A denotes OCH.sub.2 or ##STR4## and R.sub.1 denotes --CH.sub.2 CH.sub.2 OH or ##STR5## or their salts. The invention also relates to the dyeing compositions for keratin fibres, and in particular for hair, which contain a dyestuff of the above formula (I) in which R denotes alkyl, polyhydroxyalkyl, alkoxyalkyl or aminoalkyl of the abovementioned formula, and to the dyestuffs of the formula (I) in which R denotes alkoxyalkyl or aminoalkyl of the above formula, and of the formula (IIB), which are novel.

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Kobayashi, S. et al., "Cleavage of the Methylenedioxy Ring. II. Cleavage with Sodium Phenoxide and Methoxide in Dimethyl Sulfoxide", Chem. Pharm. Bull., vol. 28, No. 4, 1980, pp. 1287-1288, Tableau 1, formulas, pp. 1289-1293 (1980).
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