The bromination of fluoro-, chloro-, and bromo-cyclohexane and chloro-and bromo-cyclopentane has been investigated in the gas phase using a flow system. Unlike previous work in solution and in a static gas phase apparatus, normal directive effects were observed, and no olefinic products were obtained. These results suggest that the high yields of 1.2-dibromoalkanes reported previously in solution phase experiments are not due to ' anchimeric assistance ' although ' bridging ' by the substituent may be an important factor.
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