Disperse Dyes: Part XXI-Synthesis of Bisazo Dyes from Diaminobenzobisthiazole and Their Dyeing Properties

18-19<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Nine bisazo dyes have been synthesized in high yields by coupling tetrazotised 2,7-diaminobenzo [1,2d : <span style="font-size: 11.0pt;line-height:115%;font-family:" calibri","sans-serif";mso-ascii-theme-font:="" minor-latin;mso-fareast-font-family:"times="" new="" roman";mso-fareast-theme-font:="" minor-fareast;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"times="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">4,3d'] bisthiazole with various commercial coupling components. Investigation of the dyeing properties revealed that most of the dyes had low pick up and fastness. One dye derived from N-ethyl-N-β-cyanoethylaniline, however, gave bordeaux shade and had excellent pick up and fastness on polyester.</span

Synthesis of Silicon Coordinated Azo Dyes

20-21<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Silicon coordinated dyes have been prepared by reacting silicon tetrachloride with dyes derived from pyrazolone and acetoacetanilide in toluene in the presence of triethylamine. The silicon coordinated azo dyes are stable to water, hydrochloric acid (10%) and sodium hydroxide (10%) even on boiling. However, in dioxane, the complexes decompose when boiled with acid and alkali to give the parent dyes.</span

Disperse Dyes: Part XX-Synthesis of 4-Arylazo-1-naphthylaminoacrylates

16-17<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";color:black;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Several 4-arylazo-1-naphthylaminoacrylates have been synthesized by reacting 4-arylazo-1-naphthylamines with conjugated enol ethers like ethyl ethoxymethylenemalonate and ethyl ethoxymethylenecyanoacetate. The dyeing properties of these dyes together with those of the acyl and benzoyl derivatives of amino azo dyes have been studied. Incorporation of the acrylate chains in the dye structure has been found to improve the pickup of the dyes considerably. The light and sublimation fastness of the acrylate dyes varies from very good to excellent.</span

Disperse Dyes: Part XIX-Synthesis of Disperse Azo Dyes from 2-Amino-8Hpyrazolo (4,5-g) benzothiazole and Their Dyeing Properties

13-15<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">2-Amino-8H-pyrazolo (4,5 -g) benzothiazole has been synthesized in high yield (90%) by the action of ammonium thiocyanate and bromine in glacial acetic acid on 6-aminoindazole. An angular structure, based on NMR and mass spectral data, has been assigned to the resulting heterocyclic amine. The amine was diazotized in phosphoric acid (87%) and coupled with various coupling components in acetic acid-ethanol cosolvent. The dyeing properties of the dyes obtained have been studied.</span

Synthesis of Acid Dyes for Nylon

22-23<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Acid dyes for nylon have been prepared from m-aminoanilinoacrylates and gamma-acid under acidic conditions. The dyeing properties of the resulting dyes have been studied.</span

Disperse Dyes: Part XVIII-Synthesis of Disperse Azo Dyes from 2-Amino-6-phenylazobenzothiazole and Their Dyeing Properties

10-12<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";color:black;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">2-Amino-6-phenylazobenzothiazole has been prepared in high yield (93<span style="font-size:11.0pt; line-height:115%;font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;="" mso-fareast-font-family:"times="" new="" roman";mso-fareast-theme-font:minor-fareast;="" mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"times="" roman";="" color:#131313;mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:="" ar-sa"="">%) by the interaction of ammonium thiocyanate and bromine in glacial acetic acid. The resulting heterocyclic amine was diazotized in phosphoric-nitric acid 'mixture and was coupled with various coupling components to get azo dyes. Some of the dyes in the series showed good pick up and fastness on polyester fibre.</span