and the mixture was heated to 60 u00b0 c and stirred for 3 hours at this temperature to reduce the nitro group then the reaction mixture was mixed with sodium chloride 40 parts to deposit a solid which was collected and washed the resulting wet cake was dissolved in water 400 parts the solution was mixed with cyanuric chloride 16 7 parts and the mixture was stirred for 5 hours at 0 to 10 u00b0 c while controlling the ph within a range of 4 to 5 using a 20 aqueous solution of sodium carbonate thereby performing a first condensation to this reaction mixture was added 1 n ethylaminobenzene 3 u03b2 sulfatoethylsulfone 27 8 parts and the mixture is heated to 55 u00b0 c and maintained at a ph 4 to 5 by means of a 20 aqueous solution of sodium carbonate until the reaction has ended after 3 to 5 hours to the resulting solution is added sodium chloride to precipitate the desired product of formula 269 u03bbmax 518 nm by a similar procedure compounds of examples 270 to 295 were prepared each naphthol compound of formula xi shown in a second column of the following table was used in place of 2 amino 8.