Loren D. Durfee

Bio: Loren D. Durfee is an academic researcher from Purdue University. The author has contributed to research in topics: Intramolecular force & Aryl. The author has an hindex of 9, co-authored 18 publications receiving 839 citations.

Intramolecular coupling of .eta.2-iminoacyl and .eta.2-acyl functions at Group 4 and Group 5 metal centers: structure and spectroscopic properties of the resulting enamidolate and enediamide complexes

Abstract: During their studies of the early d-block metal chemistry associated with aryloxide ligation they have examined the reactivity of a series of mixed alkyl, aryloxide compounds toward CO and the isoelectronic organic isocyanide molecule. This has allowed them to isolate and study in detail a series of compounds containing a number of eta/sup 2/-iminoacyl functions. Furthermore they have demonstrated that intramolecular coupling of iminoacyl groups to produce enediamido ligands can take place, as well as the related coupling of iminoacyl and acyl groups. They report here in detail the synthesis of a number of enamidolate and enediamido complexes using this synthetic method and also report in detail on the coordination properties of the resulting metallacycles, an area that has received recent theoretical interest. In a subsequent paper they report a kinetic investigation of these carbon-carbon bond-forming processes.

Synthesis, structure and spectroscopic properties of early transition metal .eta.2-iminoacyl complexes containing aryl oxide ligation.

Abstract: The authors wish to report here a combination of synthetic, spectroscopic, and structural studies on a number of early transition metal aryl oxide compounds containing eta/sup 2/-iminoacyl ligands. This work has allowed us to isolate and study compounds containing more than one eta/sup 2/-iminoacyl function, a situation as yet unknown for their eta/sup 2/-acyl counterparts. Compounds such as these are of importance as they may give insights into the pathways whereby the observed intramolecular coupling (carbon-carbon double bond formation) of these types of ligand can take place to produce ene-diolate, enamidolate, or ene-diamide functional groups.

Reductive elimination pathways to low valent titanium aryl oxide complexes

Abstract: Etude de la formation d'un certain nombre de composes d'arenolates de Ti(II) et (III) par des mecanismes d'elimination reductrice induite par le coordinat

Advances in Homogeneous and Heterogeneous Catalytic Asymmetric Epoxidation

Abstract: Laboratory for Advanced Materials and New Catalysis, School of Chemistry and Materials Science, Hubei University, Wuhan 430062, China,Laboratory of Natural Gas Utilization and Applied Catalysis, Dalian Institute of Chemical Physics of Chinese Academy of Sciences, Dalian 116023,China, and Jingmen Technological College, Jingmen 448000, ChinaReceived June 30, 2004

Synthesis of Pyridine and Dihydropyridine Derivatives by Regio- and Stereoselective Addition to N-Activated Pyridines

Abstract: Stereoselective Addition to N-Activated Pyridines James A. Bull,‡ James J. Mousseau, Guillaume Pelletier,† and Andre ́ B. Charette*,† †Department of Chemistry, Universite ́ de Montreál, P.O. Box 6128, Station Downtown, Montreál, Queb́ec, Canada H3C 3J7 ‡Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, U.K. Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

Mechanism of Asymmetric hydrogenation of ketones catalyzed by BINAP/1,2-diamine-ruthenium(II) complexes

Abstract: Asymmetric hydrogenation of acetophenone with trans-RuH(η1-BH4)[(S)-tolbinap][(S,S)-dpen] (TolBINAP = 2,2‘-bis(di-4-tolylphosphino)-1,1‘-binaphthyl; DPEN = 1,2-diphenylethylenediamine) in 2-propanol gives (R)-phenylethanol in 82% ee. The reaction proceeds smoothly even at an atmospheric pressure of H2 at room temperature and is further accelerated by addition of an alkaline base or a strong organic base. Most importantly, the hydrogenation rate is initially increased to a great extent with an increase in base molarity but subsequently decreases. Without a base, the rate is independent of H2 pressure in the range of 1−16 atm, while in the presence of a base, the reaction is accelerated with increasing H2 pressure. The extent of enantioselection is unaffected by hydrogen pressure, the presence or absence of base, the kind of base and coexisting metallic or organic cations, the nature of the solvent, or the substrate concentrations. The reaction with H2/(CH3)2CHOH proceeds 50 times faster than that with D2/(...