“…EPR spectra were simulated using the WINSIM 32 program [30]. The following compounds were prepared as reported in the literature: Ti(g 6 -MeC 6 H 5 ) 2 [31], V(g 6 -1,3,5-Me 3 C 6 H 3 ) 2 [32], Nb(g 6 -1,3,5-Me 3 C 6 H 3 ) 2 [33], NbCl 3 (DME) 1.4 [34], ''pentacarbomethoxycyclopentadiene'' [35], K[pcmcp] [3], 1-benzoyl-6-hydroxy-6-phenyl fulvene [4a], and 1-benzoyl-3-nitro-6-hydroxy-6-phenyl fulvene [4b].…”