The first derivative esr spectrum of 29 bicyclo[4.2,0]octa-7-ene-2j5-semidione (1) in DMSO. 2. The first derivative esr spectrum of 32 bicyclo[4.2.0]octa-3,7-diene-2,5-dione (4o) in basic dg-DMSO after 10 minutes. 3. The first derivative esr spectrum of semi-34 quinone 6^ obtained by treating semidione 1 with air. 4. The first derivative esr spectrum recorded 36 after photolysis of a solution of semidione 1 in the esr cavity. 5. The first derivative esr spectrum (top) 42 obtained from bicyclo[4.2.0]octa-7-ene-2,5-dione (_^) in dg-DMSO; calculated spectrum (bottom) for Lorentzian line width 0.115 gauss with splitting constants from text. 6. The first derivative esr spectrum (top) of 44 semidione 69; calculated spectrum (bottom) for Lorentzian line width 0.100 gauss with splitting constants from text. 7. The first derivative esr spectrum (top) of 46 4la in basic DMSO; calculated spectrum (bottom) for Lorentzian line width 0.l4 10. The first derivative esr spectrum (top) of 59 semidione 72a; the first derivative esr spectrum (middle) of semiquinone 73a; the calculated spectrum (bottom) of semiquinone 73a for Lorentzian line width 0.25 gauss with splitting constants from Table 4. 11. The first derivative esr spectrum (top) of 6l semiquinone 73c; calculated spectrum (bottom) for Lorentzian line width 0.19 gauss with splitting constants from Table 4. 12. The first derivative esr spectrum (top) of. 63 semidione 72d; calculated spectrum (bottom) for Lorentzian line width 0.25 gauss with splitting constants from Table 4. 13. The first derivative esr spectrum (top) of 65 semiquinone 73d; calculated spectrum (bottom) for Lorentzian line width O.9O gauss with splitting constants from Table 4. 14. The first derivative esr spectrum (top) of 67 semiquinone 74e; calculated spectrum (bottom) for Lorentzian line width 0.20 gauss with splitting constants from Table 4. 15. The first derivative esr spectrum (top) of 70 semiquinone 77.; calculated spectrum (bottom) for Lorentzian line width 0.14 gauss with splitting constants from text. 16. The first derivative esr spectrum (top) of 75 semidione calculated spectrum (bottom) for Lorentzian line width O.I8 gauss with splitting constants in text. 17. The first derivative esr spectrum (top) of 78 radicals observed upon greater reduction of semidione 8I; the first derivative esr spectrum (bottom) of 2,3-dimethylsemiquinone (82). 18. The first derivative esr spectrum obtained 87 by treatment of 2,4-cyclooctadiene-l,6dione (84) with potassium t-butoxide in DMSO. vi Page 19. The first derivative esr spectrum obtained 89 from 2,4-cyclooctadiene-l,6-dione in basic DMSO under flow conditions. 20. The first derivative esr spectrum obtained 97 upon treatment of acetoxy ketone 106 with basic DMSO and traces of oxygen. 21. The first derivative esr spectrum obtained 104 by treating crude diepoxide T12 with base and DMSO under flow conditions. 22. The first derivative esr spectrum obtained 110 upon treatment of 2-cyclooctene-l,4-dione CII6) with basic DMSO. 23. Esr cell used for KOtBu/DMSO experiments...
