Dissociative ionization of aryl-substituted vinyl bromides in the gas phase: experimental and computational evidence for the formation of stable. alpha.-arylvinyl …

…, W Franke, Z Rappoport, H Schwarz…

Index: Apeloig, Yitzhak; Franke, Wilfried; Rappoport, Zvi; Schwarz, Helmut; Stahl, Daniel Journal of the American Chemical Society, 1981 , vol. 103, # 10 p. 2770 - 2780

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Citation Number: 29

Abstract

Abstract: The kinetic energy release T which accompanies the Br-loss from ionized (E)-and (Z)-0-bromostyrenes (5 and 6) in the gas phase is higher by 0.7* 0.03 kcal mol-'than that from the molecular ion of a-bromostyrene (4). Together with both collisional activation (CA) spectra and MO calculations this is interpreted as evidence for the direct formation of the a- phenylvinyl cation 7 from 4'. and exothermic isomerization of the incipient [M-Br]'species ...