Azo compounds, process for their preparation and their use as fiber-reactive dyes

New monoazo compounds are 2-(4-N-methyl-N-( beta -vinylsulfonylethyl)-amino)-6-fluoro-1,3,5-triazin-2-yl-amino)-6-(2-su lfophenyl-azo)- or -6-(1-sulfonaphth-2-yl-azo)-5-hydroxynaphthalene-1,7-disulfonic acids or their alkali metal or other colorless metal salts or compounds with a vinyl precursor group. New monoazo compounds are 6-(4-N-methyl-N-( beta -vinylsulfonylethyl)-amino)-6-fluoro-1,3,5-triazin-2-yl-amino)-6-(2-su lfophenyl-azo)- or -6-(1-sulfonaphth-2-yl-azo)-5-hydroxynaphthalene-1,7-disulfonic acids or their alkali metal or other colorless metal salts or compounds with a vinyl precursor group, of formula (I); M = hydrogen (H) or an alkali metal or another salt-forming, colorless metal; D = a 2-sulfophenyl (IIA) or 1-sulfo-naphth-2-yl (IIB) group of the formulae; R = H, 1-4 carbon (C) alkyl or 1-4 C alkoxy; R , R = H, sulfo or carboxy; R = H or sulfo; Y = vinyl or ethyl with a substituent eliminated by alkali in the beta -position. An Independent claim is also included for the preparation of (I).