Abstract
Reactions of a magnesium‐based pinacolatoboryl nucleophile with the electrophilic organoboranes, 9‐BBN and Ph3B, provide facile B−B′ single bond formation. Although the Ph3B derivative is thermally stable, when heated, the unsymmetrical diborane(5) anion derived from 9‐BBN is found to isomerize to two regioisomeric species via a proposed mechanism involving dehydroboration of the borabicyclo[3.3.1]nonane and syn‐diboration of the resultant alkenyl carbocycle.
Highlights
Our ability to generate homonuclear EÀE bonds between other p-block elements is at a much more primitive stage of development
For example, boron catenation is common in boron hydride cluster chemistry,[1] only limited methods are available for the formation of electron-precise (2c–2e) BÀB single bonds.[2]
Catalytic[5] and stoichiometric[2,6] BÀH dehydrocoupling, of more relevance to the current work are Yamashita and Nozakis reports of the lithium boryltrihydroborate (1)[7] and the triborane(5) derivative
Summary
Our ability to generate homonuclear EÀE bonds between other p-block elements is at a much more primitive stage of development. Addition of further equivalents of B2pin2 nucleophiles,[11,12] we have reported that terminal magnesium resulted in the displacement of n-BuBpin and the formation boryl species may be generated by activation of the BÀB bond of an unusual derivative (7) of the catenated triboron
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