A5006417892- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Organometallic Complex Synthesis and Catalysis
- Coordination Chemistry and Organometallics
- Crystallography and molecular interactions
- Synthesis and characterization of novel inorganic/organometallic compounds
- Carbon dioxide utilization in catalysis
- Synthetic Organic Chemistry Methods
- Carbohydrate Chemistry and Synthesis
- Asymmetric Hydrogenation and Catalysis
- Advanced Polymer Synthesis and Characterization
- Diet, Metabolism, and Disease
- Antimicrobial agents and applications
- Axial and Atropisomeric Chirality Synthesis
- Advanced NMR Techniques and Applications
- Cyclopropane Reaction Mechanisms
- Chemical synthesis and alkaloids
- Ferrocene Chemistry and Applications
- Enzyme Catalysis and Immobilization
- Organoboron and organosilicon chemistry
- Allelopathy and phytotoxic interactions
- Metal-Catalyzed Oxygenation Mechanisms
- Asymmetric Synthesis and Catalysis
- Glycosylation and Glycoproteins Research
- Molecular Junctions and Nanostructures
Villanova University
2008-2020
University of Rochester
1997-2003
California Institute of Technology
1996-2002
Carbon−carbon bond cleavage of biphenylene was achieved with (C5Me5)M(C2H4)2 (M = Rh, Co) to give the bimetallic species (C5Me5)2M2(2,2'-biphenyl). The isomorphous solid state X-ray structures these complexes showed biphenyl substrate be σ-coordinated one metal and η4-bound other. These display dynamic behavior, interchanging σ- π-bonding. Variable-temperature NMR studies were performed on both binuclear species, energy barrier for interconversion two (C5Me5) fragments calculated ΔG⧧ (350 K)...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA New Class of Zirconocene Catalysts for the Syndiospecific Polymerization Propylene and Its Modification Varying Polypropylene from Isotactic to SyndiotacticTimothy A. Herzog, Deanna L. Zubris, John E. BercawView Author Information Arnold Mabel Beckman Laboratories Chemical Synthesis California Institute Technology Pasadena, 91125 Cite this: J. Am. Chem. Soc. 1996, 118, 47, 11988–11989Publication Date (Web):November 27, 1996Publication...
To examine the effects of cyclopentadienyl and olefin substitution on preferred stereochemistry, a series singly [SiMe2]-bridged ansa-niobocene -tantalocene hydride complexes has been prepared via reduction alkylation corresponding dichloride complexes. In this manner, [Me2Si(η5-C5H4)(η5-C5H3-3-R)]M(CH2CHR')H (M = Nb, Ta; R CHMe2, CMe3; R' H, C6H5; M Me), rac- meso-[Me2Si(η5-C5H3-3-R)(η5-C5H3-3-R)]Nb(CH2CH2)H (R CMe3), [Me2Si(η5-C5H4)(η5-C5H2-2,4-(CHMe2)2)]Ta(CH2CHR')H (R' C6H5) have...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTOn the Mechanism of Dihydrogen Addition to Tantalocene ComplexesSusan P. Millar, Deanna L. Zubris, John E. Bercaw, and Richard EisenbergView Author Information Department Chemistry, University Rochester Rochester, New York 14627 Arnold Mabel Beckman Laboratories Chemical Synthesis, California Institute Technology, Pasadena, 91125 Cite this: J. Am. Chem. Soc. 1998, 120, 21, 5329–5330Publication Date (Web):May 14, 1998Publication History...
A new bis(imino)pyridine compound, 2,6-{(2,6-Me(2)-C(6)H(3))NC(t-Bu)}(2)C(5)H(3)N (), has been synthesized with t-butyl substituents on the imino carbon atoms. The stepwise synthetic method for assembly of this compound is novel. Compound and its precursor, mono(imino)pyridine , have characterized using single-crystal X-ray diffraction. Metalation attempts iron(ii) chloride under forcing conditions does not yield desired complex; use refluxing acetic acid solvent provides a minimal amount...
The phytotoxin diplopyrone is considered to be the main in a fungus that responsible for cork oak decline. A carbohydrate-based synthesis of enantiomer structure proposed has been developed from commercially available derivative d-galactose. Key steps are highly stereoselective pyranose chain-extension based on methyltitanium, preparation vinyl glycoside via Isobe C-alkynylation-rearrangement/reduction, and RCM-based pyranopyran construction. Crystallographic NMR analysis confirms an earlier...
Sterically hindered (imino)pyridine 2-{(2,6-Me2-C6H3)NC(i-Pr)}C5H4N (1) was synthesized via addition of isolated imidoyl chloride to an in situ lithiated pyridine. Room temperature 1-D and 2-D NMR spectroscopy reveals two rapidly equilibrating isomers solution. Interconversion these verified by 2D-EXSY spectroscopy. Calculations at the B3LYP MP2 levels theory reveal four relevant isomers, with atropisomers E geometry (1-EA 1-EB) Z (1-ZA 1-ZB). A simple carbon–carbon bond rotation alter...