Abstract
A hydrogen-bridging tetraborane(6) was synthesized from boryllithium, a boron nucleophile, in three steps. The structural and spectroscopic analyses of the tetraborane(6) revealed σ-donor and π-acceptor effects of diaminoboryl substituents toward the central B-B moiety having a multiple bond character. DFT calculations also supported the experimentally observed substituent effect of the boryl group.
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