SE335584

1,222,254. Aromatic sulphonamide carboxylic acids. FARBWERKE HOECHST A.G. 15 July, 1968 [15 July, 1967; 7 June, 1968], No. 33576/68. Heading C2C. [Also in Division C5M] The invention comprises compounds of the formula wherein R 1 and R 2 denote hydrogen, fluorine, chlorine, bromine, an alkyl C 1-4 or alkoxy C 1-4 residue, with the sum of the carbon atoms of the residues R 1 and R 2 not exceeding the number 7, Ar denotes a benzene, naphthalene, anthracene, diphenyl, diphenyl methane, diphenyl oxide, diphenyl sulphide, diphenyl sulphoxide or diphenyl sulphone residue, R 3 denotes hydrogen, an alkyl C 1-4 residue, the #-cyanoethyl residue, or a hydroxyalkyl residue having 2 to 4 atoms, R 4 denotes an alkylene radical having up to 15 carbon atoms which may be substituted by one or more methyl or ethyl groups, n denotes 1 and if Ar is a benzene, naphthalene or anthracene residue denotes 1 or 2, and their salts. They are prepared by reacting (R 1 )(R 2 )-Ar-SO 2 Cl with n.R 3 NH.R 4 .COOH in the presence of an acid binding agent, and subsequently, if desired reacting the acid with a base to produce a salt. Specified compounds include benzene sulphonyl-, p-toluene sulphonyl, diphenyloxidesulphonyl. and diphenylsulphonyl N-methyl-#- amino caproic acids and their triethanolammonium salts, 4 - chlorobenzenesulphonyl, diphenyloxidesulphonyl, diphenylsulphonesulphonyl - # - amino caproic acids and their triethanolammonium salts, benzene sulphonyl- # - amino undecane acid, benzene sulphonyl N- methyl - 8 - amino valeric acid, naphthalene- (1,5) or (1,6) - di(N - methyl sulphonamide - #- caproic acid) and their triethanolammonium salts, anthracene - (2) - sulphonyl - N - methyl- # - amino - caproic acid, 4 - methoxybenzene sulphonyl - N - methyl - # - amino caproic acid, 2 - bromodiphenyl sulphonamide - # - undecane acid, 2 - fluorodiphenyl sulphonamide - # - caproic acid, diphenyl sulphide - sulphonamide - 8- valeric and - # - caproic acid, diphenyl sulphoxide - sulphonamide - 8 - valeric acid and many others. The salts of the compounds of the invention act as anti-corrosive lubricants in metal - working.