GB1489695A - Photographic dye diffusion transfer process - Google Patents

Abstract

1489695 Dialkoxy benzene derivatives AGFAGEVAERT AG 10 Feb 1975 [12 Feb 1974] 5475/75 Heading C2C [Also in Divisions G2 and C4] 2 - Acetamido - 5 - hexadecylsulphonamido. 1,4 - dimethoxybenzene is prepared by adding hexadecylsulphochloride at room temperature to 2 - acetamido - 5 - amino - 1,4 - dimethoxybenzene in anhydrous pyridine, diluting with a little water, pouring on to ice and acidifying with concentrated HCl. 2-Amino-5-hexadecylsulphonamido - 1,4 - dimethoxybenzene is prepared by refluxing the above product with concentrated hydrochloric acid in ethanol and cooling. 2 - Nitro - 1,4 - didodecyloxybenzene is prepared by adding dropwise nitric acid of density 1À39 at room temperature to hydroquinone didodecyl ether in glacial acetic acid. 2 - Amino - 1,4 - didodecyloxybenzene is prepared by catalytically hydrogenating the above nitro compound in tetrahydrofuran in the presence of nickel at 30-35‹ C./50 atmospheres pressure. 2 - Acetamido - 1,4 - didodecyloxybenzene is prepared by adding acetic anhydride to the filtered hydrogenation solution above and precipitating with 1-2 times the volume of acetonitrile. 5 - Nitro - 2 - acetamido - 1,4- didodecyloxybenzene is prepared by suspending the last compound in glacial acetic acid, adding dropwise nitric acid of density 1À39 at room temperature and adding further glacial acetic acid. 5 - Nitro - 2 - amino - 1,4 - didodecyloxybenzene is prepared by refluxing the last compound with concentrated HCl in ethanol, adding strong NaOH solution till alkaline and precipitating with plenty of water. 2,5-Diamino- 1,4 - didodecyloxybenzene is prepared by catalytically hydrogenating the last compound.