Ethylene natural occurrence

Irradiation of ethyleneimine (341,342) with light of short wavelength ia the gas phase has been carried out direcdy and with sensitization (343—349). Photolysis products found were hydrogen, nitrogen, ethylene, ammonium, saturated hydrocarbons (methane, ethane, propane, / -butane), and the dimer of the ethyleneimino radical. The nature and the amount of the reaction products is highly dependent on the conditions used. For example, the photoproducts identified ia a fast flow photoreactor iacluded hydrocyanic acid and acetonitrile (345), ia addition to those found ia a steady state system. The reaction of hydrogen radicals with ethyleneimine results ia the formation of hydrocyanic acid ia addition to methane (350). Important processes ia the photolysis of ethyleneimine are nitrene extmsion and homolysis of the N—H bond, as suggested and simulated by ab initio SCF calculations (351). The occurrence of ethyleneimine as an iatermediate ia the photolytic formation of hydrocyanic acid from acetylene and ammonia ia the atmosphere of the planet Jupiter has been postulated (352), but is disputed (353). 

Some of the reasons for the occurrence of multiphase BEDT-TTF salts are the conformational freedom of the ethylene groups of the BEDT-TTF molecule, and the cooperative interactions caused by the k-k (face-to-face) overlap and sulfur-sulfur (side-by-side) atomic contact these cooperative interactions result in the 2D nature of BEDT-TTF charge-transfer (CT) complexes [18]. One of the polymorphs of P-I3 salt (a-13), has been found to change into a stable 8 K superconductor (at-13) by tempering this is considered to have a structure similar to that of high-T. P-I3 [19]. 

SMITH K.A. and RUSSELL R.S. 1969 Occurrence of ethylene and its significance in anaerobic soil. Nature, London, 222, 469-471. 

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