GB316143A - Process for the manufacture of hydroxy-1. 8-naphthoylene-naphthimidazoles and sulphuric acids thereof - Google Patents

Abstract

316,143. I. G. Farbenindustrie Akt.- Ges. July 23, 1928, [Convention date]. Hydroxy - 1<1> : 8' naphthoylenenaphthimidazoles, and sulphonic acids thereof are made by fusing with caustic alkali a 1<1> : 8<1>-naphtheylenenaphthimidazole sulphonic acid obtainable by condensing naphthalic acid anhydride with an onaphthylenediamine mono- or polysulphonic acid. In examples (1) 1<1> : 8<1>-naphthoylene-a-1 : 2- naphthimidazole-6- or 8-sulphonic acid (from 1 : 2-naphthylenediarnine-5- or 7-sulphonic acid respectively and naphthalic anhydride) is fused with caustic potash to form the 6- or 8-hydroxy compound respectively, (2) 1<1> : 8<1>-naphthoylenea-1 : 2-naphthimidazole-6 : 8- or 7 : 9-disulphonic acid (obtained from 1 : : 2-naphthylenediamine- 5: 7- and 6 : 8-disulphonic acid respectively and naphthalic anhydride) is fused with caustic potash to form 1<1> : 8<1>-naphthoylene-a-1 : 2- naphthimidazole - 6 - hydroxy-8-sulphonic or 9- hydroxy-7-sulphonic acid respectively. The Specification as open to inspection under Sect, 91 (3) (a) states that 6-hydroxy-3<1> or 6<1>- hydroxy - 1<1> : 8<1> - naphthoylene-a-1 : 2-naphthimidazole, and 6-hydroxy-4<1>- or 5<1>-hydroxy-1<1> : 8<1>- naphthoylene-a-1 : 2-naphthimidazole may be obtained in a similar manner. It also states that derivatives of hydroxy-1<1> : 8<1>-naphthoylenenaphthimidazoles and their sulphonic acids may be obtained from derivatives of 1<1> : 8<1>- naphthoylenenaphthimidazole sulphonic acids and derivatives of naphthalic anhydride. This subject-matter does not appear in the Specification as accepted.