Diacetylenes methane

Diacetylene is formed as a significant by-product in the commercial synthesis of acetylene by the pyrolysis of methane and other hydrocarbons . Smaller amounts of triacetylene are also formed . Procedures have been devised for removing and recovering the diacetylenc - . 

The experimental studies reported here have led to the identification of a large number of gas-phase ion/molecule reactions and reaction sequences which act to build ions containing Si-C and Si-O bonds. Si-C bonds were observed to be established in the reactions of Si with acetylene, cyanoacetylene, methylcyanide and acetone, while diacetylene and possibly methane were found to be resistant to silicon implantation. The results obtained with methanol, ethanol, and formic acid are striking In that they suggest that the sequential chemistry with these molecules initiated by Si is inexorably directed toward increasing silicon-oxygen co-ordination. 

Fig. 39. Equilibrium in partial methane oxidation without formation of diacetylene. The dependence of numbers of moles of individual constituents formed from 1 mole methane, on the number of moles of oxygen in the initial mixture, at 1650 K and 1 atm pressure. For notation...

Subsequent to the 1982 compilation of Lounila and Jokisaari [237], a large number of studies report chemical shift anisotropies for various nuclei in liquid crystalline solvents. Representative examples include ACTh in dichloromethylphosphine [243], methylisothiocyanide [244], and norborna-diene [141] A(Tc in chloro- and bromoform [245], bis(trimethylsilyl)diacetylene [246], and pyridine, pyrazine, pyridazine, and pyrimidine [247] ACTh and ACq in butyne [248], fluoro- [245,249], bromo- [245], and iodomethane [244, 245, 250], ethylene [251], methylisocyanide [252], dimethyl-mercury [253], benzene [250, 254, 255], 1,3,5-trichloro- [99, 256], 1,3,5-tribromo-[244], and 1,3,5-trinitrobenzene [244] Afluoro-methane [249] Aa in dimethylmercury [253] AcTsein carbon diselenide [258] AcTje in tellurophene [259] and AOxe [260]. 

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