Preparation of N-substituted anilines

Details Preparation of N-substituted anilines Preparation of N-substituted anilines

1982-02-22

1983-06-21

Helfin, Bernard

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

Organic compounds

Carboxylic acid esters

C07C 6730

Patent

active

043895310

ABSTRACT:
Disclosed is a process for the preparation of disperse dye couplers of the general formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are typical groups such as straight or branched alkylene for R.sub.1, phenyl, cyclohexyl or straight or branched substituted or unsubstituted alkyl for R.sub.2, hydrogen, lower alkyl, halogen, lower alkoxy, acylamido and the like for R.sub.3, and n is 1, 2 or 3, comprising contacting under hydrogen atmosphere a mixture of at least one amine compound of the formula ##STR2## or its nitro precursor and at least one compound of the formula ##STR3## in the presence of from about 1 to about 10 parts of a hydrogenation catalyst per part of the amine or its nitro precursor, and from about 5.3.times.10.sup.-4 to about 1.0.times.10.sup.-1 mole per mole of said amine or its nitro precursor of one or more of lower alkyl sulfonic acid or benzenesulfonic acid which may be substituted with 1-3 lower alkyl groups such as p-toluenesulfonic acid.

REFERENCES:
patent: Re29468 (1977-11-01), Clayton
patent: 2470094 (1949-05-01), Dickey et al.
patent: 3978064 (1976-08-01), Johnson et al.
patent: 4013662 (1977-03-01), Harbert
Wagner et al., Synthetic Org. Chem. (1965), pp. 654-657.
Glickman et al., Jour. Amer. Chem. Soc., vol. 67 (1945), pp. 1017-1020.

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