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The first X-ray structure analysis of a bismuthio ylide has been made for 4,4-dimethyl-2,6-dioxo-1 -triphenylbismuthiocyclohexanide. The Bi–Cylide bond is 2.16 Å, only 0.05–0.06 Å shorter than the Bi–CPh single bond, revealing that the Bi–Cylide bond is polarized as C––Bi+ or O––C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
C–Bi+ with little double bond character between the Bi and the ylidic carbon.
M. Yasui, T. Kikuchi, F. Iwasaki, H. Suzuki, T. Murafuji and T. Ogawa, J. Chem. Soc., Perkin Trans. 1, 1990, 3367 DOI: 10.1039/P19900003367
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