GB525091A - Anthrapyridone dyestuffs - Google Patents

Abstract

525,091. Dyes. LODGE, F., and IMPERIAL CHEMICAL INDUSTRIES, Ltd. Feb. 15, 1939, No. 5008. [Class 2 (iii)] 4-Arylamino-N-arylanthrapyridone sulphonic acids, where aryl is a phenyl, which may carry alkyl or cycloalkyl substituents, diphenyl, or naphthyl (which may be hydrogenated) radical are made by monoacetylating the corresponding 1:4-diarylaminoanthraquinones, ring- closing the acetyl derivatives, and sulphonating the products. The monoacetylation may be effected by heating with acetic anhydride and a little concentrated sulphuric acid in acetic acid or nitrobenzene, and the ring closure may be effected by heating under alkaline conditions, e.g. with sodium hydroxide in #-ethoxyethyl alcohol. Sulphonation may be effected with oleum. The products dye animal fibres, such as wool or silk, in red to violet shades. In examples, mono- and di-sulphonic acids are made from 1:4-dianilinoanthraquinone, 1-anilino-4-p-toluidinoanthraquinone, 1:4 - di - p - butylanilinoanthraquinone, 1:4-di-p-toluidinoanthraquinone, 1:4-di-p-toluidino-6-hydroxyanthraquinone, 1:4-di-p-anisidinoanthraquinone, 1:4-di-p-butoxyanilinoanthraquinone, 1:4- di-p-phenoxyanilinoanthraquinone, 1:4-di-mchloranilinoanthraquinone, 1:4-di-mesidinoanthraquinone, 1:4-di-p-phenylanilinoanthraquinone, 1:4-di-#-naphthylaminoanthraquinone, and 1:4-di-(5<SP>1</SP>:6<SP>1</SP>:7<SP>1</SP>:8<SP>1</SP>:-tetrahydro-#- naphthylamino)-anthraquinone. Specifications 28765/06, [Class 2 (iii)], and 1212/10, [Class 2], are referred to.