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|Section2= |Section3= }} Thioindigo is an organosulfur compound that is used to dye polyester fabric. A synthetic dye, thioindigo is related to the plant-derived dye indigo, replacing two NH groups with two sulfur atoms. Thioindigo is generated by the alkylation of the sulfur in thiosalicylic acid with chloroacetic acid. The resulting thioether cyclizes to 2-hydroxythianaphthene, which is easily converted to thioindigo.〔Elmar Steingruber "Indigo and Indigo Colorants" in ''Ullmann's Encyclopedia of Industrial Chemistry'', 2004, Wiley-VCH, Weinheim. 〕 The related compound 4,7,4',7'-tetrachlorothioindigo, also a commercially important dye, can be prepared by chlorination of thioindigo. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「thioindigo」の詳細全文を読む スポンサード リンク
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