Abstract
A new family of unsymmetrical, N,C-chelate organoboron compounds B(ppz)(Mes)Ar have been synthesized and found to undergo a rare, regioselective two-stage photoisomerization, involving the Ar group only. The initial transformation is a Zimmerman rearrangement to afford yellow azaboratabisnorcaradiene isomers that are subsequently converted to unprecedented 14aH-diazaborepins via a photochemical “walk” rearrangement. Spectroscopic and computational studies provide insight into the formation and properties of these unique systems.
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