GB338126A - Process for the manufacture of hydroxy di- and tri-aryl methane compounds - Google Patents

Abstract

338,126. Carpmael, A., (I. G. Farbenindustrie Akt.-Ges.). Aug. 9, 1929. Mothproofing; proofing compositions.-Bromonated and chlorinated o-oxydi- and o-oxytriarylmethanes prepared by chlorinating or brominating the parent compounds are useful for protecting wool, fur, hair, or the like against moths and other pests. The protecting agents may be applied to the wool &c. in the form of a solution in an organic solvent or they may be added to the dyebaths whereby the materials are simultaneously dyed and protected. According to examples of the manufacture of the protecting agents :- (1) 2 : 2<1>-dioxy-5 : 5'-dichlordiphenylmethane is brominated in glacial acetic acid solution whereby a dibrom-2 : 2<1>-dioxy-5 : 5<1>-dichlordiphenylmethane is produced. The oxyarylmethanes prepared from the following pairs of components may similarly be brominated, with or without a diluent : formaldehyde (1 mol.) and p-bromphenol (2 mols.), or m-chlorphenol (2 mols.), o-sulphobenzaldehyde (1 mol.) and pchlorphenol (2 mols.), p-chlorbenzaldehyde (1 mol.) and p-cresol (2 mols.); (2) o-hydroxydiphenylmethane is treated with bromine in chloroform solution whereby 2-hydroxy-3: 5-dibromdiphenylmethane is obtained The latter may be further halogenated; (3) 3 : 5-dichlor-2-hydroxydiphenylmethane is prepared by treating a carbontetrachloride solution of the parent material with sulphurylchloride. The product may be further halogenated. The condensation product from p-chlorphenol and 2:4: 5-trichlorbenzylchloride is mono-chlorinated.