case with 100 ml of water 500 ml of hydrochloric acid about 37 were again added to the combined water washings and the mixture stirred for 1 hour the precipitate was filtered off with suction washed 4 times with 100 ml of acetone to displace the water and dried in a desiccator 26 34 g 0 124 mole 82 4 of product were obtained all operations were carried out under nitrogen ______________________________________elementary analysis calculated found______________________________________c 33 8 33 5 h 4 7 4 5 n 13 1 12 9 cl 33 3 32 9 ______________________________________ 57 g 0 15 mole of 1 3 dibenzyloxy 4 6 dinitrobenzene were added to 500 ml of hydrochloric acid about 37 and 200 ml of tetrahydrofuran 20 g of pd c 5 were added to the mixture the mixture was hydrogenated at 75 u00b0 c and 3 5 bars hydrogen pressure until no further hydrogen was taken up the batch was filtered with suction the material on the suction filter was washed 3 times each time with 250 ml of water 1 000 ml of hydrochloric acid about 37 were again added to the combined water washings and the mixture was stirred for 1 hour the precipitate was filtered.