Verfahren zur Herstellung ungesättigter Sulfone

1,170,269. Unsaturated sulphones and process for their production. SANITIZED Inc. 23 Dec., 1966 [27 Dec., 1965], No. 57607/66. Heading C2C. α,#-Unsaturated sulphones of the formula wherein R is an alkyl, substituted alkyl, alkenyl, substituted alkenyl, aryl, substituted aryl, aralkyl, cycloalkyl or heterocyclic radical, R 1 and R 2 are hydrogen or alkyl or aryl radicals and X is -CN, -COOR 3 , -CONH 2 , -COR 3 , -NO 2 or an -SO 2 R 3 radical wherein R 3 is an alkyl or aryl group, may be obtained by reacting in a liquid reaction medium, a vicinal dihalogenide of the formula wherein Y and Z are halogens, with a sulphinic acid derivative of the formula wherein M represents an equivalent of a cation selected from alkali metals, alkaline earth metals, NH 4 + or hydrogen, in the presence of an added alkaline material, said reactants and alkaline material being at least partly soluble in said reaction medium. Compounds of the formula wherein A is a divalent radical and is straight or branched chain optionally substituted alkylene, arylene, substituted arylene, cycloalkylene, substituted cycloalkylene or a heterocyclic radical, may be obtained by reacting under the same conditions a bis-sulphinic acid derivative of the formula with the vicinal dihalogenide of Formula (II) above. The liquid reaction medium, which is generally maintained at a pH of 4-11, is preferably an alcohol of up to 12 carbon atoms and the preferred alkaline materials employed are carboxylic acid salts Sulphinic acids are prepared by reducing an organic sulphonyl chloride with an inorganic sulphite.