Despite all these facts and interpretations, the results presented below provide unequivocal evidence for direct carboalumination, which must be assisted by a Zr-containing species, at least in some typical Zr-catalyzed carboalumination reactions of terminal alkynes. Furthermore the alkyl-halogen exchange, that we previously considered to be an essential step required for carbozirconation with alkylalanes and C12ZrCpz, not only is ...
