Process for producing a monoazodye by diazo-coupling of a p-nitr

Details Process for producing a monoazodye by diazo-coupling of a p-nitr Process for producing a monoazodye by diazo-coupling of a p-nitr

1993-03-29

1996-07-02

Powers, Fiona T.

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

Organic compounds

Azo

534575, 534887, C09B 4100, C09B 29085, C09B 6710

Patent

active

055323448

ABSTRACT:
A process for producing a monoazodye of the following formula (III): ##STR1## wherein X.sup.1 is nitro or halogen, X.sup.2 is halogen, R.sup.1 is lower alkoxy, R.sup.2 is lower alkyl, each of R.sup.3 and R.sup.4, which are independent of each other, is alkyl, cyanoalkyl or alkylcarbonyloxyalkyl, and each of m and n, which are independent of each other, is 0 or 1, which comprises diazotizing an aniline derivative of the following formula (I): ##STR2## wherein X.sup.1 and X.sup.2 are as defined above, followed by coupling with an aniline derivative of the following formula (II): ##STR3## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, m and n are as defined above, wherein a reaction mixture obtained by the coupling reaction is heat-treated in the presence of a polyoxyethylene higher fatty acid ester type nonionic surfactant, followed by filtration to obtain said monoazo compound in the form of a cake.

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