Reactions Involving the M—C., Bond

Treatment of the tungsten complex [W(=C=C=CPh2)(CO)5[ with benzylidene-isopropylimine gives rise to the formation of the azetidinylidene derivative 41 through a formal [2 + 2] cycloaddition between the Co =Cp moiety and the iminic 

Unlike the chromium and tungsten allenylidenes 46, the coupling of the indenyl-ruthenium(II) allenylidene SO with ynamine MeC=CNEt2 takes place regioselectively 

The electron-deficient allenylidene moiety in complex [RuCp(=C=C=CPh2)(CO) (PiPr3)][BF4j (6) can act as dienophile in Diels-Alder cycloadditions [73]. Thus, 

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