Monochlorotetrazinyl Reactive Dyes:Synthesis and Characterization

摘要

In present studies,the synthesis and characterization of monochlorotetrazinyl reactive dyes are reported. Triaminoguanidine monohydrochlqride was prepared by reacting guanidine hydrochloride with hydrazine mono-hydrate and then,converted to 3,6-bis(3,5-dimethylpyrazol-l-yl)-1,2-dihydro-1,2,4,5-tetrazine by adding 2,4-pentanedione. 3,6-Dihydrazino-1,2,4,5-tetrazine was obtained by the reaction between 3,6-bis(3,5-dimethylpyrazol-1-yl)-1,2-dihydro-1,2,4,5-tetrazine and hydrazine monohydrate. 3,6-Dichloro-1,2-,4,5-tetrazine was formed by passing chlorine through 3,6-dihydrazino-1,2-,4,5-tetrazine. The structures of products were confirmed by melting points,HPLC,FT-IR,~(13)C or ~1H NMR and mass spectral data. The chromophore groups of three different dyestuffs known (Reactive blue 4,orange 1 and red 2) were prepared and characterizated by ~1H NMR. By reacting trichlorotriazinyl and dichlorotetrazinyl groups with them,dichlorotriazinyl and monochlorotetrazinyl dyes were obtained and their dyeing efficiencies on cotton were tried to be determined in subsequent studies.