Patent ID: 6372893
Filing Date: 2002-04-16
Classification: C09B

Abstract:
A compound of the formula (I) whereR1 and R2 are independently â€”H or â€”SO3H, subject to the proviso that at least one of R1 and R2 must be â€”SO3H, X is a halogen atom, Y is an alkali-detachable group, R3 is â€”NR4R5, where R4 and R5 are independently hydrogen; a linear or branched C1-10 alkyl group; a phenyl group, which may optionally be substituted by one or more identical or different radicals; or R4 and R5 may combine with the nitrogen to which they are bonded to form a C3-C8 ring which may additionally contain one or more identical or different heteroatoms, subject to the proviso that when R4 or R5 is an â€”SO2CH2CH2OSO3H substituted phenyl group, R1 is always â€”SO3H, or a mixture thereof or its salt.