Process for preparing aromatic nitriles

Details Process for preparing aromatic nitriles Process for preparing aromatic nitriles

1996-03-04

1997-04-08

Richter, Johann

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

Organic compounds

Nitriles

558319, 558346, 558435, 558 55, 558366, C07C25300

Patent

active

056189656

ABSTRACT:
Process for preparing a nitrile of the formula (I) ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 are for example hydrogen, halogen, cyano, hydroxyl, carboxyl, alkyl, alkoxy, alkylthio, alkylamino, dialkylamino, aryl, aryloxy, arylthio or arylamino, or R.sub.2 and R.sub.3 together form a substituted or unsubstituted 4-membered carbon bridge,
by reacting an aldehyde of the formula (II) ##STR2## with a hydroxylammonium salt followed by dehydration by heating to an elevated temperature, wherein the reaction takes place in the presence of an anhydrous inorganic sulfate and in the absence of diluents from the group consisting of carboxylic acids, strongly polar aprotic solvents, sulfur compounds and heteroaromatic basic nitrogen compounds.
The nitriles obtainable by the process of the invention are valuable intermediates for, in particular, the preparation of diketopyrrolopyrrole pigments.

REFERENCES:
patent: 5349103 (1994-09-01), G ulec
Chem. Abstract 114:101296d (1991).
J. Chem. Soc. IX, p. 43, (1933).
Chemistry & Industry 5, p. 176, (1991).
Synth. Comm. 22(14), pp. 2125-2128, (1992).
Synthesis, pp. 943-944, (1992).
Chem. Abstract 85:93176e of DD 117,872 (1976).
Chem. Abstract 90:151771m (1979).
Chem. Abstract 114:206700j (1991).

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