4, 4'-Diketodicyclohexyl (III).-Crude 4, 4'dihydroxydicyclohexyl (11), prepared from p, p'- diphenol (I) by high pressure hydrogenation over Raney nickel catalyst by the method of Adkins, a was converted to (111) as follows. A mixture of 50 g. of (11), 50 ml. of diphenyl ether, and 13 g. of copper chromite catalyst was heated for three hours at 260-270”. During this time 70y0 of the theoretical quantity of hydrogen necessary for complete conversion to ...
