Evidence for the Formation of ?-Dianions of 9-Fluorenone and 10,11-Dihydro-5H-dibenzocyclohepten-5-one from 1H NMR and CNDO Charge Distributions

Article abstract of DOI:10.1246/cl.1987.413

It was demonstrated on the basis of reactivity, 1H NMR and CNDO charge distributions that the ?-dianions of 9-fluorenone and 10,11-dihydro-5H-dibenzocyclohepten-5-one were formed from the corresponding neutral precursors in contact with sodium or potassium in dimethoxyethane or tetrahydrofuran at low temperature in vacuo.