Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis[5-nitro-, reaction products with 3-[(4-amino-5-methoxy-2-methylphenyl)azo]benzenesulfonic acid monosodium salt

in reflux conditions, sodium hydroxide solution in 1,2-Bis(4-nitro-2-sulfophenyl)ethane sodium salt between two with 3-Aminobenzenesulfonic aciddiazotization and 2-Amino-4-methylanisole coupled with product heating (40260). In reflux conditions (or a little take pressure), in sodium hydroxide solution 1,2-Bis(4-nitro-2-sulfophenyl)ethanewith 4-Aminobenzenesulfonic acid sodium diazotization and 2-Amino-4-methylanisole coupled with product heating (40265).