By Wolfgang Kirmse (Auth.)
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This publication by way of Kaplan and Vekhter brings jointly the molecular international of the chemist with the condensed topic international of the physicist. sooner than the cave in of the Soviet Union, chemists within the West committed lit to relationships among molecular digital constitution and tle awareness solid-state vibronic phenomena.
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The product composition showed a definite phase dependence. The change from gas to liquid and solid phase reduced the yields of ethylene and acetylene, with a concomitant increase of apparent methylene insertion products (241). Observations on the statistical nature of the formation of various hexanes from rc-pentane (242) were confirmed with propane. The ratio of η-butane to isobutane approached 3 : 1 in the liquid and solid phases (241). Indiscriminate reaction with carbon-hydrogen bonds is characteristic of methylene.
0]hexane, and methylenecyclopentane, 1 5 - 2 0 % of dicyclohexylazine (752, 754). I R examination of the reaction mixture immediately following partial photolysis showed the presence of diazocyclohexane. It is likely that the dicyclohexylazine is formed from the diazo compound. Photolysis of pentamethylenediazirine in acetic acid led to the formation of 39 % of cyclohexyl acetate (752, 755). Since the diazirine does not react with acetic acid in the dark, it is probable that cyclohexyl acetate arises from trapping of the intermediate diazocyclohexane.
C H 30 ) 2C : ^CH \ ^ Χ + 3 γ -CO—OCH 3 / • · CH 3 + C0 2 ' (63) C H 3C O - O C H 3 Pyrolysis of the cyclic ketal  affords an almost quantitative yield of tetrachlorodiphenyl, and 95 % of the ketal bridge is accounted for by the equimolar quantities of ethylene and C 0 2 evolved (190,192). A concerted pathway for the fragmentation of  is rendered unlikely, however, by the fact that  decomposes much more slowly than does [53a]. ,  (191). 6 C1 Çl ÇH 3 C l ^ ^ C O - O - C H - C H - C l + ^ m : H 3C H C=C H CH, X Quadricyclanone ketals have been investigated as potential sources of dialkoxycarbenes.