Hl. Holt et al., The ring expansion of a dimethyl-substituted vinylcyclobutene derivative by metal complexes that can undergo an inner-sphere electron transfer, J ORGMET CH, 601(1), 2000, pp. 147-152
The ring expansion of a dimethyl-substituted vinylcyclobutene derivative to
the corresponding dimethyl-substituted cyclohexadiene or aromatic compound
was studied. It was found that metal complexes of Ni(I), Ti(III), Sm(II),
and Fe(II), which can undergo an inner-sphere electron-transfer reaction, a
llow the rearrangement to occur at room temperature. Other oxidation states
of these metals and complexes that can only undergo an outer-sphere electr
on-transfer process do not promote this ring expansion reaction. (C) 2000 E
lsevier Science S.A. All rights reserved.