| The title compounds, which contain 'twist-bent' carbon-carbon bonds, were prepared by multi-step syntheses starting with trans-;Isomerization to 7,7-dichloro-cis-bicyclo (4.1.0) hept-3-ene occurred when 7,7-dichloro-trans-bicyclo (4.1.0) hept-3-ene was heated in solution. The activation parameters for this unimolecular isomerization were obtained by NMR kinetics in solvents of widely varying polarity. The Arrhenius parameters in toluene-;Upon thermolysis, 7,7-dibromo-trans-bicyclo (4.1.0) hept-3-ene underwent a ring-expansion to 1,7-dibromo-1,4-cycloheptadiene. The activation parameters were obtained in toluene-;Both of the title compounds are inert to photoinduced single electron transfer conditions, i.e. no reaction occurred when each compound was irradiated in the presence of 4,4... |
