S. Deangelis et al., SOLVENT-DEPENDENT FORMS OF LITHIATED 5,5,10,10,15,15,20,20-OCTAETHYLPORPHYRINOGEN IN SOLUTION AND IN THE SOLID-STATE AND REACTION WITH TETRAHYDROFURAN, Journal of the Chemical Society. Dalton transactions, (16), 1994, pp. 2467-2469
The fully lithiated form of 5,5,10,10,15,15,20,20-octaethylporphyrinog
en (H-4L) synthesized in tetrahydrofuran (thf ) has been structurally
characterized in its solvated form Li4L.3thf, while its unsolvated for
m from n-hexane behaves as a 'superbase' capable of decomposing thf to
the lithium enolate identified in the aggregate Li6L(OCH=CH2)2.4thf.