Heteroallenes reactivity

Heptane-4,6-dione, decafluoro-metal complexes decomposition, 385 Heptane-2,4,6-trione metal complexes, 399 Heteroallenes coordinated reactivity, 579 metal complexes, 579 Heterocyclic nitrogen compounds basic pKa... 

The formal acetals of ketene 2, e.g. (diethoxyvinyhdene)triphenylpho-sphorane 4, are highly reactive and, hke 2, add all sorts of H-X compoimds such as carboxylic acids, alcohols, amines, 1,3-dicarbonyls etc. across their C=C bond. Heterocycles result from cycloadditions of these yhdes to heteroallenes [17]. 

Lu E, Lewis W, Blake Liddle ST. The ketimide Ugand is not just an inert spectator heteroallene insertion reactivity of an actinide—ketimide linkage in a thorium carbene amide ketimide complex. Angew Chem Int Ed. 2014 53 9356-9359. 

The insertion of isocyanides provides another example of this reactive behavior. Insertion reactions of isocyanides and heteroallenes carried out with the tripod-stabilized early-late heterodinuclear complexes (represented in Figure 4.5) that led to stable products are summarized in Scheme 4.8. 

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