Improved Syntheses of Versatile Ruthenium Hydridocarbonyl Catalysts Containing Electron‐Rich Ancillary Ligands

Abstract

Clean, high-yield routes are established to the important catalyst chlorobis(tricyclohexyl- , or with the appropriate NHC ligand, then PCy 3 . Advantages over prior routes to these complexes lie in the high yields from a conveniently accessible precursor, the absence of by-products that otherwise prove difficult to remove, and the short reaction times under experimentally convenient conditions.

Isomerization During Olefin Metathesis: An Assessment of Potential Catalyst Culprits

“…Decane (Sigma–Aldrich, anhydrous, 99 %) and potassium trispyrazolylborate (TCI Chemicals, 97 %) were used as received. Complexes GII ,34 Ru‐1 ,16 Ru‐2 ,35 Ru‐2′ ,35 Ru‐2′′ ,35 Ru‐3 ,36 and Ru‐4 37 were prepared according to literature methods. Yields in catalytic runs were measured on an GC (Agilent 7890A) equipped with a flame ionization detector (FID) and polysiloxane column (Agilent HP‐5) at an inlet split ratio of 10:1 and inlet temperature of 250 °C.…”

Searching for the Hidden Hydrides: The Competition between Alkene Isomerization and Metathesis with Grubbs Catalysts

“…More recently, chemists have sought to exploit isomerization processes, and some significant methodological gains have been achieved;7 Donohoe et al8 recently highlighted the effectiveness of isomerization as a synthetic tactic. Hong et al characterized diruthenium hydride species 2 ,9 Arisawa and co‐workers10 and, more recently, Fogg et al11 prepared 3 ;12 complex 4 is also known,13 and all three species are known to act as isomerization catalysts. For example, 1.5 mol‐% 2 catalyzed the isomerization of allyl benzene to E / Z 2‐methylstyrene in 76 % yield over 24 h at 40 °C 9a.…”

Regioselective formation of β‐(E)‐ and α‐alkenylsilane moiety attached to silsesquioxane core via Pt‐ and Ru‐based hydrosilylation

“…[RuHCl(CO)(PCy 3 ) 2 ], [RuHCl(CO)(PPh 3 ) 3 ], [Fe(CO) 3 (dvds)] (dvds = 1,3‐divinyltetramethyldisiloxane) and [{Rh(μ‐OSiMe 3 )(cod)} 2 ], as well as chloroethynyldimethylsilane and ethynylsiloxy‐substituted POSS, i.e. POSS‐OSiCCH, were prepared according to literature procedures . All solvents were dried over CaH 2 prior to use and stored under argon over type 4A molecular sieves.…”