Organic chemistry
1911
Journal of the Chemical Society Abstracts
Absorption of Hydrocarbon Gases by Non-aqueous Liquids. ALONZO Stlnpsox MCDANIEL (J. Physiccd Chem., 1911, 15, 587-610). - The absorption of methane, ethane, and ethylene in ten organic liquids has been determined at a series of temperatures lying between 30" and 60". The gas burette and Ostwald absorption pipette were waterjacketed, and the temperatures were maintained approximately equal by means of a suitably proportioned resistance coil in each jacket, the two coils being in series. The gas
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... in the burette was saturated with the solvent vspour and measured at the temperature of each absorption experiment, so that no correction for vapour pressure of solvent was necessary. The solvents were boiled under diminished pressure, and precautions were adopted to remove dissolved air, the presence of which introduces considerable errors. The solvents, in order of increasing absorptive power at 25' for methane, are methyl, amyl, ethyl, isopropyl alcohols, benzene, toluene, ~n-xylene, hexane, heptttne. With ethane and ethylene the solvents fall into a similar series, which, however, is quite unlike the order of the same solvents for the less soluble gases nitrogen, carbon monoxide, hydrogen, and carbon dioxide. It is suggested that the solubilities of the hydrocarbon gases are largely influenced by specific chemical relations with the solvents. The absorption coefficient decreases in all cases as the temperature rises, lit. J. C. Preparation of py-Dimethyl-Aav-butadiene. EADISCHE ANILIN-9: SODA-FABRIK (D.R.-P. 23531 l).-A 70% yield of py-dimethyl-Aau-butadiene can be obtained by heating pinacone or pinacolin a t 400" with a dehydrating agent followed by fractional distillation of the products. F. M. G. M. Action of Di-iodoacetylene on Organic Bases. WILLIAM M. DEHN (J. Amer. Chenz. Soc., 191 1, 33, 1598-1601).-Di-iodoacetylene can be prepared in a yield of 80-90% of the theoretical by passing acetylene into a solution of potassium iodide and adding sodium hypochlorite solution drop by drop. On mixing solutions of di-iodoacetylene and triethylamine in ether, the compound, NEt"2C2T" m. p. 1 1 5 O , separates in feathery needles. Dipropylamine when treated in the same way yields the cornpound, NHPr"2C21" m. p. 160", which forms long needles. By the action of acetylene di-iodide on phenylhjdrazine, nitrogen is evolved and iodophenylacetylene is produced, together with two phenylhydrazine hydriodides, 2N HPh*NH"HI, rn. p. 128' (decomp.),
doi:10.1039/ca9110000829
fatcat:mfi57cslv5dehbk7gltjjklfi4