Formation of a diynedienyl ligand by coupling of hexa-2,4-diyne and hex-2-yn-4-en-4-yl ligands onto a triruthenium cluster core

The reaction of the cluster complex [Ru-3(mu -H)(mu (3)-eta (2)-ampy)(CO)(9 )] (Hampy = 2-amino-6-methylpyridine) with an excess of hexa-2,4-diyne give s the trinuclear derivative [Ru-3(mu (3)-eta (2)-ampy){mu-eta (5)-MeC drop CC(=CHMe)CMe-CC drop CMe}(mu -CO)(2)(CO)(5)] as the final product. This com pound contains an unprecedented diynedienyl ligand that arises from the cou pling of hexa-2,4-diyne with the hex-2-yn-4-en-4-yl ligand of the intermedi ate [Ru-3(mu (3)-eta (2)-ampy)(mu-eta (3)-MeCH=CC drop CMe)(mu -CO)(2)(CO)( 6)], which is the first compound observed in the reaction of 1 with hexa-2, 4-diyne.