Monoazo dyes of the benzothiazole series, their preparation and use in dyeing or printing hydrophobic fibres.

摘要

A compound of the formula,
<CHEM>
wherein R1 is an alkyl group having 4 to 9 carbon atoms, R2 is an alkyl group having 1 to 6 carbon atoms, a cyano- or halogen-substitued alkyl group having 1 to 6 carbon atoms, R3 is a hydrogen atom or a lower alkyl, amino or phenyl group, and Y1 and Y2 represent independently a hydrogen atom, a lower alkyl group, a lower alkoxy group, a halogen atom, a nitro group, a cyano group, a thiocyanate group or an alkylsulfonyl group, provided that both Y1 and Y2 are not hydrogen at the same time and Y1 is located at the 4- or 5-position, which is useful for dyeing hydrophobic fibers in brilliant red to violet shade with good fastnesses. A method of preparation of the compound is described.