T. Lund et al., DOES THE REACTION BETWEEN FLUORENONE AND GRIGNARD-REAGENTS INVOLVE FREE FLUORENONE ANION-RADICALS, Tetrahedron letters, 35(49), 1994, pp. 9225-9226
The ratio between 1,6- and 1,2-addition in the reactions of electrogen
erated fluorenone anion radicals with RX in THF were similar to the ra
tio obtained in the Grignard reaction of fluorenone with RMgX in THF.
This indicates that the addition products in the Grignard reaction may
be obtained via the coupling of freely diffusing fluorenone anion rad
icals with R radicals.