Sulfo group-containing azo compounds having a tetrazo component radical derived from an optionally substituted 3,8-diaminodibenzofuran

Claim 1

A compound of the formula ##STR187## or a salt thereof, wherein (a) one of R 2a and R 3a is ##STR188## and the other is ##STR189## b. one of R 2a and R 3a is ##STR190## c. one of R 2a and R 3a is ##STR191## and the other is ##STR192## wherein R 4a is hydrogen, hydroxy, sulfo or ##STR193## R 5a is hydroxy, carboxy, amino, N-(C 1-4 alkyl)amino, N-phenylamino, N,N-di-(C 1-4 alkyl)amino, N-(C 1-4 alkyl) N-(C 1-4 alkyl)phenylamino, N-(C 1-4 alkyl)-N-benzylamino or N-(C 1-4 alkyl) N-(C 1-4 alkyl)phenylsulfamoyl, each R 6a is independently amino or hydroxy, each R 7a and R 8a is independently hydrogen, C 1-4 alkyl, halo or sulfo, each R 9a is independently hydrogen, C 1-4 alkyl, halo or cyano, R 10a is hydroxy, amino or acetamido, R 11a is hydrogen, carboxy or hydroxy, R 12a is hydrogen, sulfo, C 1-4 alkyl, C 1-4 alkylsulfonyl, C 1-4 alkoxy, C 1-4 alkylamino, phenylamino, (C 1-4 alkoxy)phenylamino or trimethylphenylamino, each of R 13a and R 14a is independently hydrogen or sulfo, each R 15a is independently 2-ethylhexyl, butyl, phenyl, (C 1-4 alkyl)phenyl, (C 1-4 -alkoxy)phenyl, di-(C 1-4 alkoxy)phenyl or disulfonaphthyl, R 16a is C 1-4 alkyl, phenylsulfonyl or (C 1-4 alkyl)phenylsulfonyl, R 18a is hydrogen or C 1-4 alkyl, R 19a is hydrogen or C 1-4 alkyl, R 20a is hydrogen, halo, C 1-4 alkyl or C 1-4 alkoxy, R 21a is hydrogen or sulfo, and R 22a is 4,6-dichloro-1,3,5-triazinyl-2,2,6-dichloropyrimidyl-4,2,5,6-trichloropyrimidyl-4,4-chloro-6-(4'-sulfophenylamino)-1,3,5-triazinyl-2,4-chloro-6-(phenylamino)-1,3,5-triazinyl-2 or 5-chloro-2,6-difluoropyrimidyl-4, and X is hydrogen or sulfo, with the provisos that (1) the compound contains 1, 2, 3 or 4 sulfo groups, (2) R 2a and R 3a are different, and (3) X is hydrogen when R 3a is ##STR194##