| Abstract
| - Bis(ketenimines), in which the two heterocumulenic functions are placed in close proximity on a carbon skeleton toallow their mutual interaction, show a rich and not easilypredictable chemistry. Intramolecular [2 + 2] or [4 + 2]cycloadditions are, respectively, observed when both ketenimine functions are supported on either ortho-benzylic or2,2‘-biphenylenic scaffolds. In addition, nitrogen-to-carbon[1,3] and [1,5] shifts of arylmethyl groups in N-arylmethyl-C,C-diphenyl ketenimines are also disclosed.
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