(Pentamethylcyclopentadienyl)Iridium Dichloride Dimer {[IrCp*Cl2]2}: A Novel Efficient Catalyst for the Cycloisomerizations of Homopropargylic Diols and N-Tethered Enynes
iridium dichloride dimer [IrCp*Cl2]2}-catalyzed hydroalkoxylation of bis-homopropargylicalcohols provides an efficient access to dioxabicyclo[2.2.1]ketals. The cycloisomerizations proceed under mild conditions, with low catalytic loadings and short reaction times. This new protocol involving an Ir(III) catalyst also promoted the cycloisomerization of nitrogen-tethered 1,6-enynes to give azabicyclo[4
The synthesis, optical resolution through derivatization, characterization and utilization of a new helical bisphosphinite–gold complex derived from HELIXOL are described.
A series of new secondary phosphine oxide (SPO)–gold(I) complexes have been synthesized and characterized by X-ray crystallography. Complexes exhibited dimeric structures interconnected by O–H···Cl hydrogen bonds. Their first use in homogeneous catalysis is reported and suggests a broad field of application in prototypical enyne cycloisomerization and hydroxy- and methoxycyclization reactions.
A 1,3-bis-diphenylphosphine allene can give birth to new coordination complexes with palladium, platinum and gold metals. These complexes were fully characterized by NMR, HRMS and X-ray diffraction analysis. For gold(I),...
Asymmetric catalysis: The rhodium‐catalyzed asymmetric [2+2+2] cyclization of 1,6‐enynes and aldehydes was achieved by using a cationicrhodium(I)/(R)‐binapcomplex as a catalyst (see scheme; cod=1,5‐cyclooctadiene). Coordination of the substrate heteroatom to the cationicrhodium plays an important role in this cyclization reaction.