Tetracarbonyl norbomadiene>chromium

Surprise products sometimes appear in reactions with metal carbonyl derivatives. For instance in the reaction of 5 with bis(norbomadiene) chromium tetracarbonyl, the product isolated 8, is one in which the silylene has become incorporated into the bicyclic ring structure. 

The photolytic generation of an active T)rpe II species from norbomadiene-chromium tetracarbonyl is an interesting possibihty in this system, for example, (norbomadiene) chromium tricarbonyl. 

Nitroxyls s. N-Oxide radicals Norbomadiene s. Chromium tetracarbonyl-norbornadiene Norrish type I cleavage 20, 534s31... 

Cr, Mo and W Fe, Ru and Os The reaction of norbomadiene(tetracarbonyl)-chromium and -tungsten with aryUithium reagents and subsequent alkylation afforded the dialkene-caibene complexes [M( n -C7Hg)(CO)3(=C(OEt)Ar)], stmcturally characterised for M = Cr and Ar = 4-CH3C6H4. 

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