Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 16, Issue 23, Pages 6861-6865Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200903395
Keywords
boranes; Lewis bases; radicals; stabilization energy
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Radical stabilization energies (RSE)s have been calculated for a variety of boryl radicals complexed to Lewis bases at the G3(MP2)-RAD level of theory. These are referenced to the B-H bond dissociation energy (BDE) in BH3 determined at W4.3 level. High RSE values (and thus low BDE(B-H) values) have been found for borane complexes of a variety of five- and six-membered ring heterocycles. Variations of RSE values have been correlated with the strength of Lewis acid Lewis base complex formation at the boryl radical stage. The analysis of charge- and spin-density distributions shows that spin delocalization in the boryl radical complexes constitutes one of the mechanisms of radical stabilization.
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