Abstract
The vinyl carbenoid H2C=CBr(Li) has been used as key precursor to prepare a geminal C(sp2)‐bridged phosphine‐borane. Starting from bromoethene, two sequences of lithiation/electrophilic trapping, with ClPiPr2 and FBMes2 respectively, affords iPr2P–C(=CH2)–BMes2 3 [Mes = 2,4,6‐(H3C)3C6H2]. This new phosphine‐borane 3 was characterized by multi‐nuclear NMR and mass spectroscopy. It adopts a monomeric open structure without P→B interaction. A few crystals of a secondary product 4 were analyzed by X‐ray diffraction, revealing an unusual dimeric structure.
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