73463-62-4

Upstream product

• 172266-60-3 (CO)5Re(BO₂C₆H₄) 
• 71-43-2 benzene 
• 108-88-3 toluene 
• 14285-68-8 decacarbonyldirhenium⁽⁰⁾ 
• 111-66-0 oct-1-ene 

Downstream Products

• 14285-68-8 decacarbonyldirhenium⁽⁰⁾ 
• 16457-30-0 hydridopentacarbonylrhenium(I) 

Relevant academic research and scientific papers

Mechanistic Study of a Re-Catalyzed Monoalkylation of Phenols

A mechanistic study of a rhenium catalyzed monoalkylation of phenols is described. Reaction kinetics reveals a zero-order dependence on both alkene and phenol and a half order dependence on catalyst. Isotopic labeling studies, competition experiments, kinetic isotope effects, and Hammett analysis together afford experimental data consistent with a reversible C-H activation step and an irreversible hydrometalation process. The turnover-limiting step is identified as catalyst deaggregation. NMR studies of binary mixtures of catalyst and a single substrate (alkene or phenol) as well as those of reaction mixtures identify potential intermediates and off-cycle species. Despite the numerous Re complexes formed in these mixtures, the overall reaction is both high yielding and highly selective for monoalkylation of phenols.

The cyclo-C3 ligand: Trimetallic cyclopropenium complexes of Group 6-8 metals, including the X-ray crystal structure of [{Fe(CO)2(Cp)}3(μ3-C3)][SbF 6]

Several trimetallic cyclopropenium cations have been prepared via reactions of three equivalents of a metallate anion with [C3Cl3][SbF6]. The X-ray crystal structure of [{Fe(CO)2(Cp)}3(μ3-C3)][SbF 6] (1) shows a nearly equilateral C3 ring with an iron center bonded to each vertex. The cyclopropenium complexes [{Ru(CO)2(Cp)}3(μ3-C3)][SbF 6] (2), [{Mo(CO)3(Cp)}3(μ3-C3)][SbF 6] (3), [{W(CO)3(Cp)}3(μ3-C3)][SbF 6] (4), and [{Re(CO)5}3(μ3-C3)][SbF 6] (5) were spectroscopically characterized. Because of the 3-fold symmetrical nature of these complexes, their NMR spectra display a single cyclo-C3 ring carbon resonance and a single set of resonances for the metal moiety. Compound 1 reacts with Li[BHEt3] and LiMe to give complex reaction mixtures. We were not able to add a fourth metal center to the C3 ring of 1. The spectroscopically characterized C9 complex [{Fe(CO)2(Cp)}3{μ3-C 3(C≡C)3}][SbF6] (6), prepared by the reaction of three equivalents of [Fe(C≡CSiMe3)(CO)2(Cp)] with [C3Cl3][SbF6], was not stable enough to isolate in analytically pure form.