Yellow-violet dithiazine-furan and pyrrole cpds - for bulk dyeing synthetic materials, as disperse dyes for hydrophobe

摘要

Cpds. are of formula (I): (where R1 and R1 are each the atoms or gps. of atoms required to complete a heterocycle of aromatic character or an opt. substd. aromatic ring; R2 is a direct bond or a bridge of formula: -NR4-, -NR4-CO-, -NR4- SO2 or -NR4-CO-NR4- or a bivalent hydrocarbon radical opt. substd. and/or contg. heteroatoms: R3 is hydrocarbon radical opt. substd. and/or contg. hetero-atoms and contg. at least nC atoms; R4 is H or opt. substd. alkyl; R5 is H or hydrocarbon radical opt. substd. and/or contg. heteroatoms; X is O or N, providing that when X is O, R2 and R3 are absent; n is 1, 2 or 3 and that when X is O, n is only 1; the molecule is free from sulphonic acid gps. and when X is O, it is also free from carboxylic acid gps.).