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The oxidative coupling of anionic imidazol‐4‐ylidenes protected at the C2 position with [MnCp(CO)2] or BH3 led to the corresponding 4,4′‐bis(2H‐imidazol‐2‐ylidene) complexes or adducts, in which the two carbene moieties are connected through a single C−C bond. Subsequent acidic treatment of the later species led to the corresponding 4,4′‐bis(imidazolium) salts in good yields. The overall procedure...
Carbenchemie Ein Janus‐artiges dimeres N‐heterocyclisches Carben wird von D. A. Valyaev, N. Lugan et al. in ihrer Zuschrift auf S. 8118 ff. vorgestellt. Das Molekülgerüst des Biscarbens ermöglicht eine signifikante elektronische Kommunikation.
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