1-(2-sulfonatoethyl)-2,3,3-trimethyl-3H-indolenine-5-sulfonic acid 、
3-[4-oxa-5-(tert-butyloxycarbonyl)pentyl]glutaconaldehyde-dianilide-hydrobromide 在
sodium acetate 作用下,
以
乙酸酐 、
溶剂黄146 为溶剂,
反应 0.83h,
以41%的产率得到trisodium 3,3-dimethyl-2-{7-[3,3-dimethyl-5-sulfonato-1-(2-sulfonatoethyl)-3H-indolium-2-yl]-4-(6-carboxy-4-oxahexyl)hepta-2,4,6-trien-1-ylidene}-1-(2-sulfonatoethyl)-2,3-dihydro-1H-indole-5-sulfonate