Abstract
The first carbene complexes 1 (R = H, Me; X = Cl, Br) of divalent chromium were obtained selectively by addition of hydrogen halides to the metal–carbon triple bond in [(η5-C5R5)(CO)2Cr≡CNiPr2]. These carbene complexes react with isocyanides, phosphanes, and phosphites to give cationic CrII carbene complexes.
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