Aromatic aldehydes and process for preparing them

Details Aromatic aldehydes and process for preparing them Aromatic aldehydes and process for preparing them

C - Chemistry, Metallurgy

07

D

260/314.3, 260/5

C07D 235/30 (2006.01) C09B 55/00 (2006.01)

Patent

CA 1037480

ABSTRACT OF THE DISCLOSURE Aldehydes of a 2-hydroxy-naphthalene-3-carboxylic acid arylide of the general formula Image in which X represents a hydrogen, chlorine or bromine atom, and Ar represents a naphthyl group, a benzimidazolone or chlorobenzimidazolone group or a phenyl group which may carry 1 to 3 lower alkyl, lower alkoxy, lower alkylsulfonyl, lower carboalkoxy, halogen, trifluoromethyl, nitro, cyano, lower alkanoylamino, benzoylamino, carboxamido or sulfonamido groups, and a process for their pre- paration wherein the corresponding 2-hydroxy-naphthalene-3-carboxylic acid ary- lide is reacted in a lower aliphatic carboxylic acid with hexamethylene tetra- mine and a mineral acid. These aldehydes are valuable intermediate products for the synthesis of optical brighteners and, in particular, of axamethine pigments which are obtained by condensation of these aldehydes with suitable amines. The pigments thus obtained are distinguished by good fastness properties and are especially suitable for the printing of paper and the coloring of lacquers, varnishes and plastics.

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