Substituted 3-carbalkoxy 4-alkylamino-azobenzene compound as disperse dyestuffs for synthetic fibers

A dyestuff represented by the formula:

• ##STR6## U is chlorine, bromine, cyano, nitro, carbomethoxy, carbethoxy or mesyl, V is cyano, nitro or mesyl,
• W is hydrogen, chlorine, bromine, cyano or nitro,
• R is alkyl containing 1 to 4 carbon atoms,
• X is hydrogen, bromine, chlorine, acetylamino, benzoylamino, alkoxycarbonylamino containing 2 to 5 carbon atoms, phenoxycarbonylamino, alkylsulfonylamino containing 1 to 4 carbon atoms or phenylsulfonyamino, and
• B is
• .beta.-chlorethyl,
• .beta.,.gamma.-dichloropropyl,
• 3. 3,4,4,4-pentafluorobutyl,
• alkyl containing 1 to 4 carbon atoms unsubstituted
• or mono-substituted by cyano, nitro, phenyl, phenoxy, alkoxy containing 1 to 4 carbon atoms, carbophenoxy, alkylsulfonyl containing 1 to 4 carbon atoms, phenylsulfonyl, acetyl, cyanalkoxy containing 2 to 5 carbon atoms or carbalkoxy containing 2 to 5 carbon atoms, said carbalkoxy being unsubstituted or mono-substituted by cyano, acetyl or carbalkoxy containing 2 to 5 carbon atoms,
• or --(CH.sub.2).sub.n --OR' wherein n is a whole number from 1 to 4 and R' is hydrogen, acetyl, propionyl, butyryl, benzoyl, carbalkoxy containing 2 to 5 carbon atoms, carbophenoxy, alkylsulfonyl containing 1 to 4 carbon atoms or phenylsulphonyl.