Mohamed F.A.Mohareb R.M.Textile Research DivisionNational Research CentreDokkiGiza12622Egypt; Chemistry DepartmentsFaculty of ScienceCairo UniversityGizaEgypt; Faculty of PharmacyOctober University for Modern Science & Arts (MSA)Elwahaat RoadOctober CityGizaEgypt2020-01-092020-01-09201415606074https://doi.org/10.1108/RJTA-18-03-2014-B004PubMed ID :https://t.ly/GgErbScopusEthyl 2-diazo-4, 5, 6, 7-tetrahydrobenzo[b] thiophene-3-carboxylate is reacted with malononitrile to give a hydrazone derivative. The latter product is reacted with 1-diazobenzene-4-?-sulphatoethylsulphone (PABSES) to give a disperse dye. The dye is synthesised by diazotisation and coupling reactions. First, it is synthesised with the chromophoric moiety of ethyl 2-hydrazomalononitrilo-4,5,6,7-tetrahydrobenzo[b] thiopheen- 3-carboxylate and coupled with diazonium salts that have the aforementioned reactive groups, thus yielding the new target reactive. The synthesised dye is applied onto wool, polyester and wool-polyester (blend) fabrics under typical exhaust dyeing conditions and their dyeing properties are investigated. The structure of this dye is characterised and confirmed by melting point, elemental analysis, infrared, ultraviolet-visible spectroscopy (UV/VIS) and nuclear magnetic resonance ( 1 H-NMR) data. The dyeing of polyester, wool and polyester/wool blend fabrics with a reactive disperse dye gives very good build up and fastness properties by using a nonionic vinylsulphone (VS) derivative, which increases the substantivity of the dye towards wool fabric. Maximum exhaustion as well as total fixation efficiency by using a sulfatoethylsulfone (SES)-based dye on wool fabric is achieved at a neutral pH of 7. This feature of the dye structure significantly improves the union dyeing of wool/polyester blend fabrics with very good build up and fastness properties. � 2014 Emerald Group Publishing Limited.Englishجامعة أكتوبر للعلوم الحديثة والآدابUniversity of Modern Sciences and ArtsMSA UniversityUniversity for Modern Sciences and ArtsMSA Universityجامعة أكتوبر للعلوم الحديثة والآدابDiazobenzeneDyeingFabricsReactive disperse dyesSynthesisTetrahydrobenzo[b] thiopheneArticlehttps://doi.org/10.1108/RJTA-18-03-2014-B004PubMed ID :