used with ethyl acetate as solvent the hydrogenation temperature was maintained at 25 u00b0 c and the pressure at 50 to 60 psig 0 3 to 0 4 mpa although the theoretical amount of hydrogen was consumed both overhydrogenation and underhydrogenation products were present in the final product example ix was repeated using two grams of a ruthenium catalyst containing five weight percent of ruthenium on carbon the solvent was isoproponal and the temperature 50 u00b0 c in this case only 70 percent of the theoretical amount of hydrogen was consumed indicating perhaps catalyst poisoning a total of 50 grams of dinitrobenzophenone assay 96 5 weight percent of which 94 percent was m m 39 dinitrobenzophenone and six weight percent was the m p 39 isomer dissolved in 400 milliliters of tetrahydrofuran was subjected to hydrogenation in a one liter autoclave in contact with eight grams of nickel catalyst at a temperature of 150 u00b0 c and a hydrogenation pressure of 500 psig 3 5 mpa until the reaction stopped on workup as before 40 2 grams of diaminobenzophenone were obtained containing nine weight percent of tetrahydrofuran of crystallization a total of 40 grams of dinitrobenzophenone of which 94 weight percent was m m 39 dinitrobenzophenone and four weight percent was m p 39 dinitrobenzophenone was charged to a one liter stainless steel autoclave along with five grams of ni 104 p catalyst in 400 milliliters of diglyme the catalyst had previously been activated in tetrahydrofuran at 200 u00b0 c and a hydrogen pressure of 1000 psig 7 0 mpa for one half hour the autoclave was purged with hydrogen and the temperature was brought to 140 u00b0 c while the contents were vigorously stirred the pressure was.