Preparation of dyes derived from Eriochrome Red B and Acid Alizarin Violet N soluble in organic solvents
作者:Alan R. Katritzky、Bogumila Rachwal、Stanislaw Rachwal、Terrance P. Smith、David W. Macomber
DOI:10.1002/recl.19931121007
日期:——
Both hydroxy groups of Eriochrome Red B are protected by acetylation and the sulfonic acid group is converted to the sulfonyl chloride with phosphorus pentachloride. Reaction with dibutylamine or N-butylbenzeneethanamine followed by the deprotection gives red azo dyes 7a or 7b, readily soluble in chloroform and toluene. A similar procedure applied to Acid Alizarin Violet N gives only a multicomponent
Eriochrome Red B的两个羟基均受到乙酰化的保护,磺酸基团被五氯化磷转化为磺酰氯。与二丁胺或N-丁基苯乙胺反应,然后脱保护,得到红色的偶氮染料7a或7b,其易溶于氯仿和甲苯。应用于酸性茜素紫N的类似步骤仅产生多组分混合物。二丁基氨磺酰氯与2-硝基苯酚之间的弗瑞德-克来福特反应产生N,N-二丁基-4-羟基-3-硝基苯磺酰胺(11)。硝基的还原得到胺14,其被重氮化并与2-萘酚偶合以得到所需的染料13 得到深红色的甲醇,氯仿和丙酮溶液。