Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Patent
1994-12-12
1996-08-27
Kumar, Shailendra
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
564138, 564140, C07C23100
Patent
active
055502865
ABSTRACT:
Process for the of aromatic carboxamides from aromatic carboxylic acids and urea
Process for the preparation of aromatic carboxamides of the formula (I) ##STR1## in which R.sub.1, R.sub.2, and R.sub.3 are identical or different and are hydrogen, fluorine, chlorine or bromine atoms, or are alkyl(C.sub.1 -C.sub.4), hydroxyl or nitro groups, or R.sub.1 and R.sub.2 form an aromatic ring of 5 or 6 ring members, which ring may be substituted by fluorine, chlorine or bromine atoms or by alkyl(C.sub.1 -C.sub.4), hydroxyl or nitro groups, which involves reacting aromatic carboxylic acids of the formula (II) ##STR2## in which R.sub.1, R.sub.2 and R.sub.3 are as defined above with urea in an inert organic solvent with the addition of a catalytic amount of phosphorous acid.
REFERENCES:
Cherbuliez et al, Helv. Chimi. Acta, 29, 1438-46, 1946.
Egyptian Journal of Pharmaceutical Sciences, "Study of Fusion of Urea with Some Aromatic Acids" `New Findings`, vol. 13, No. 2, 231-235 (1972).
Chemical Abstracts, "Benzonitriles", Abstract No. 22297z of JP-A-06 032 758, vol. 103, No. 3, pp. 548 (Feb. 19, 1985).
Christidis Yani
Meier Michael
Hoechst AG.
Kumar Shailendra
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