Steric Modulations in the Reversible Dimerizations of Phenalenyl Radicals via Unusually Weak Carbon-Centered π- and σ-Bonds
作者:V. Zaitsev、S. V. Rosokha、M. Head-Gordon、J. K. Kochi
DOI:10.1021/jo051612a
日期:2006.1.1
self-associations of various tricyclic phenalenyl radicals lead reversibly to either π- or σ-dimers, depending on alkyl-substitution patterns at the α- and β-positions. Thus, the sterically encumbered all-β-substituted tri-tert-butylphenalenyl radical (2•) affords only the long-bonded π-dimer in dichloromethane solutions, under conditions in which the parent phenalenyl radical (1•) leads to only the σ-dimer. Further