The activation with cis-RuCl2(Ph2PCH2PPh2)2 1 of HC = C-CR2OH and HC = C-C(Me) = CH2 leads to allenylidenes trans-(Cl)Ru+ = C = C = CR2(Ph2PCH2PPh2)2 (R = Ph, Me, p-Cl-Ph) and that of HC = C-C = C-CPh2OSiMe3 affords a new allenylidene-ruthenium complex 9 via an intramolecular ortho C-H bond addition.