methyl 6-(4-[(4-diethylaminophenyl)(4-diethylimino-2,5-cyclohexadien-1-ylidene)methyl]-3-sulfo-1-phenylsulfonamido)hexanoate 在
lithium hydroxide 作用下,
以
1,4-二氧六环 为溶剂,
反应 1.5h,
以40%的产率得到{4-[[4-(5-Carboxy-pentylsulfamoyl)-2-sulfo-phenyl]-(4-diethylamino-phenyl)-methylene]-cyclohexa-2,5-dienylidene}-diethylammonium