Dimerization of terminal alkynes catalyzed by indenyl ruthenium(II) complexes

Chloro(η5-dihydropentalenyl)bis(triphenylphosphine)ruthenium(II): synthesis, structural characterization and catalytic activity in the dimerization of phenylacetylene

“…The g 5 -indenyl complexes (g 5 -C 9 H 7 )Ru(PPh 3 ) 2 H and (g 5 -C 9 H 7 )Ru(PPh 3 ) 2 (CCPh) are also active in the catalytic dimerization of phenylacetylene [26]. Unlike the other four compounds cited above, however, ring slip of the indenyl group from g 5 to g 3 coordination plays an important role in the reaction mechanism.…”

Metal Vinylidenes as Catalytic Species in Organic Reactions

“…Some of the catalysts that have been employed include: TpRu(PPh 3 ) 2 Cl, [108] TpRu(MeiPr 2 P)C(Ph) =C(Ph)C≡CPh, [109] Ru(ma) 2 (PPh 3 ) 2 , [110] (η 5 -C 9 H 7 )Ru(PPh 3 ) 2 C≡CPh, [111] and RuCl 2 (PCy 3 ) 2 =CHPh. [112] The selective head-to-head dimerization of aliphatic alkynes through a vinylidene mechanism, however, was not successfully addressed for some time.…”

Metal Vinylidenes and Allenylidenes in Catalysis: Applications in Anti‐Markovnikov Additions to Terminal Alkynes and Alkene Metathesis

“…A variety of ruthenium complexes containing trispyrazolyl, [131][132][133][134] P(CH 2 CH 2 PR 2 ) 3 , [126,127] N(CH 2 CH 2 PR 2 ) 3 , [135] pentamethylcyclopentadienyl, [136] indenyl, [137,138] and maltolato ligands, [139] the metathesis catalysts [RuCl 2 (PCy 3 ) 2 -(=CHPh)] [140] and [RuCl 2 (PiPr 3 ) 2 (=C=CHPh)], [141,142] as well as a dinuclear (C 5 H 5 ) 2 Ru 2 complex [143] promote the formation of Z and E enynes. Polyaddition of 2,7-diethynyl-9,9-dioctylfluorene with [RuCl 2 (PiPr 3 ) 2 ( = C = CHPh)] in the presence of N-methylpyrrolidine produces polymers containing the enynyl fragment with high Z selectivity.…”