Comparative study of the pyrolysis, photoinduced electron transfer (PET), and laser-jet and 185-nm photochemistry of alkyl-substituted bicyclic azoalkanes
laser-jet and 185-nm photochemistry of 2,3-diazabicyclo[2.2.1]hept-2-ene (1a), syn-7-methyl-2,3-diazabicyclo[2.2.1]hept-2-ene (syn-1b), anti-7-methyl-2,3-diazabicyclo[2.2.1]hept-2-ene (anti-1b), 1,4-dimethyl-2,3-diazabicyclo[2.2.1]hept-2-ene (1c), 7,7-dimethyl-2,3-diazabicyclo[2.2.1]hept-2-ene (1d), and syn-7-(1-methylethyl)-2,3-diazabicyclo[2.2.1]hept-2-ene (syn-1e) were investigated and the results
Photochemical and ESR spectral evidence for a stereoselective rearrangement of radical cations derived from azoalkanes and bicyclopentanes
作者:Waldemar Adam、Herbert Walter、Guo Fei Chen、Ffrancon Williams
DOI:10.1021/ja00034a037
日期:1992.4
responsible for the stereoselective olefin formation can be assigned to a radical cation rearrangement. This was established on the basis of direct ESR evidence showing that the 1,3-diyl radical cations 1a,bsup .+} detected initially at 80-90 K following the radiolytic oxidation of 1a,b in CFsub 3}CCIsub 3} rearranged stereoselectively into the olefin radical cations 3a,bsup .+} at 105 K. The ESR results