SEARCH Articles Figures Tables Allenylidene Allenylidene complexes Allenylidene-Ruthenium Complexes as Alkene Metathesis Catalyst Precursors the First Evidence Allenylidenes Allenylidenes complexes Cycloaromatization via Ruthenium-Allenylidene Complexes Ruthenium allenylidene Ruthenium allenylidene complexes formation Ruthenium allenylidenes