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Pseudo-nitrosites.-Two hundred cc. of propylene gas was confined for one to two days in a tube with 0.5 cc. of liquid nitrogen trioxide and 3-4 cc. of absolute ether.The propylene pseudo-nitrosite16 which separated was crystallized from ethyl acetate; m. p. 120°; yield 0.2 g. The crystals did not decompose in a week. Aliene pseudonitrosite,17 m. p. 88°, was prepared similarly in about 0.1-g. yield. These crystals decomposed within twenty-four hours. The precipitate which formed from 200 cc. of a 3:2 mixture of propylene and aliene was 0.1 g. of propylene pseudo-nitrosite, m. p. 120°. In another experiment 2 drops of diallyl was added to the mixture of ether and nitrogen trioxide before absorbing 160 cc. of propylene gas.

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