Polymer Production in Radiolysis of Benzene^1,2

Abstract

They specifically note an inability to detect free NH in the electric discharge through ammonia even at low pressure. Unfortunately, there does not appear to be any direct evidence of reaction or absence of reaction in the gas phase between NH radicals, i.e. NH + NH -> Nj + H2 (8) or between NH radical and some other molecule such as NH¡ or N2H4. Reaction 6 has a formal sim-M(?)ilarity to CH2 + H2 -> CH4, which appears to be rather well established.63•24 Reactions between NH and NH2 radicals are ruled out by the fact that the yields of N2 and N2H4(the products of the presumed reactions 2 and 5 or 8) are not interdependent (cf. section 4.1.7).The catalytic effect of platinum walls on hydrazine formation suggests the importance of a reaction which can interrupt the back reaction, 2 or 4, e.g., M

Gamma irradiation of hexafluorobenzene

“…The elemental analysis of the 20° polymer was near that of the parent compound ( table 2 ). The deficit, 100—C—F —H, and H content may represent contaminations in handling, difficulties of quantitative fluorine determination, or in the case of the deficit possibly oxygen absorption during storage [ 16 , 17 ]. The quantity of the 218° C polymer was not sufficient for analysis.…”

“…The deficit may be attributed either to poor accuracy of fluorine analyses or to oxygen absorbed during the period between opening of samples and analysis. The polymeric product from irradiated benzene is highly reactive with oxygen [ 16 ], and the related material from fluorocarbons could react not only with oxygen but with moisture as well. These reactions should have been minimized in the present work by the fact that the longest storage of samples was in the crystalline or glassy form.…”

“…Benzene has been studied very extensively, both because of its low sensitivity and the possibility that it can exhibit a “protective” effect in mixtures. Likewise, a few higher aromatic hydrocarbons have been studied [ 16 to 18 ]. In radiation chemical studies in general, atom and free-radical mechanisms have been fairly well accepted [ 19 ], though seldom unequivocally proven.…”

BIRCH‐Reduktion von [2.2] Metacyclophan

“…I t collapses and coalesces to a broad singlet at approximately 145" C. A chair-like conformation and conformational changcs of I1 arc discussed. (111). In Tabelle 1 sind neben den chemischen Verschiebungen der Pro- tonen in I1 vergleichsweise auch diejenigen von I, 111…”

“…(111). In Tabelle 1 sind neben den chemischen Verschiebungen der Pro- tonen in I1 vergleichsweise auch diejenigen von I, 111…”