New ruthenium vinylidene complexes as intermediates for the access to .sigma.-acetylide and unsymmetrical trans-diynyl, alkynyl metal complexes. Crystal structures of [(Ph2PCH2PPh2)2(Cl)Ru=C=CH2]PF6 and [(Ph2PCH2PPh2)2(Cl)RuC.tplbond.CH] complexes

Abstract
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