Abstract
By reaction with pentacarbonyl(η2-cis-cyclooctene)chromium(0) (1) various diaryl diazo compounds have been converted into the corresponding chromium carbene complexes 9−15, 18, and 19 which, in certain cases, show extraordinary low-field 13C NMR shifts (>400 ppm) for the carbene carbon atoms. The carbene complexes obtained by this “diazo route” undergo insertion of nucleophilic alkynes such as 1-(diethylamino)-1-propyne or ethoxyethyne into the metal−carbene bond to yield the α,β-unsaturated carbene complexes 20−28 by C2 homologization.
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