Oil soluble acylated dye

525,042. Dyes. ARMOUR & CO. Feb. 13, 1939, No. 4662. Convention date, Feb. 17, 1938. [Class 2 (iii)] Oil-soluble derivatives of aromatic dyes containing chromophoric groups and having at least one aromatic nucleus containing at least one hydrogen atom replaceable by an acyl group are manufactured by reacting such a dye with a fatty acid chloride having at least twelve carbon atoms, in the presence of a Friedel-Crafts catalyst, hydrolyzing the intermediate Friedel- Crafts reaction product and recovering the oilsoluble dye. The products are soluble in petroleum hydrocarbons, e.g. gasoline, kerosene, lubricating oils and paraffin waxes, in fats and fatty oils, e.g. linseed oil and other vegetable oils and edible oils such as cotton-seed oil, and in soaps of the vegetable and animal fatty acids. In examples: (1) the dye base precipitated from Chrysoidine by the action of alkali is reacted with stearyl chloride in the presence of aluminium chloride and carbon tetrachloride ; (2) the dye base obtained by adding alkali to an aqueous solution of Bismark Brown is similarly treated in the presence of tetrachlorethane ; (3) Para Fuchsine base is treated as in (2) ; (4) the dye base from Victoria Green W.B. is similarly treated ; (5) the dye base from Methyl Violet 2B is reacted with lauryl chloride in the presence of aluminium chloride and tetrachlorethane ; (6) nigrosine is treated as in (2) ; (7) phenosafranine is similarly treated ; (8) the dye base from proflavine is similarly treated. Other acid chlorides specified are myristyl, palmityl, arachidyl, betenyl, oleyl and linolenyl chlorides.