The hydroboration of a conjugated diphenylphosphanylenyne with Piers' borane [HB(C6F5)2] gives three products. The major product is probably formed by generation of a geminal P/B frustrated Lewis pair that undergoes rapid and subsequent intramolecular conjugate addition of the phosphane to the dienyl borane unit to yield a unique phosphonium borata–diene. The minor products originate from alternative regioisomeric hydroboration reactions. Two examples of the new phosphonium borata–olefin products were characterized by X‐ray diffraction.
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Yu et al. (2013) studied this question.
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