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Dive into the research topics where Timothy Powers is active.

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Featured researches published by Timothy Powers.


Angewandte Chemie | 1999

Kombinatorische Materialforschung und Katalyse

Bernd Jandeleit; Dieter J. Schaefer; Timothy Powers; Howard W. Turner; W. Henry Weinberg

Nach dem Paradigmenwechsel, der in der pharmazeutischen Industrie stattfand, als durch kombinatorische Methoden der Prozes zur Entdeckung neuer Wirkstoffe unwiderruflich verandert wurde, werden nun kombinatorische Methoden in zunehmendem Mase auch zur Entdeckung und Optimierung neuer und effizienterer Katalysatoren und Materialien eingesetzt (siehe Abbildung). Mit der Entwicklung und dem Einzug neuer kombinatorischer Synthese- und Screening-Methoden, kombiniert mit integrierter Datenverwaltung, eroffnet die Anwendung dieser Methoden in den Materialwissenschaften und der Katalysatorforschung ein enormes Potential und erweckt hohe Erwartungen in dieser neuen und aufregenden Disziplin.


Tetrahedron Letters | 1999

A convenient palladium/ligand catalyst for Suzuki cross-coupling reactions of arylboronic acids and aryl chlorides

Xiaohong Bei; Thomas Crevier; Anil Guram; Bernd Jandeleit; Timothy Powers; Howard W. Turner; Tetsuo Uno; W. Henry Weinberg

Abstract The Pd/ligand A catalyst efficiently catalyzes general Suzuki biaryl cross-coupling reactions of arylboronic acids and aryl chlorides.


Angewandte Chemie | 1998

Solid‐Phase Synthesis and Encoding Strategies for Olefin Polymerization Catalyst Libraries

Thomas R. Boussie; Carla Coutard; Howard W. Turner; Vince Murphy; Timothy Powers

Active polymerization catalysts, novel resin-bound diimine complexes of nickel(II) and palladium(II) are obtained by combinatorial synthesis and combined in a catalyst library. By tagging with fluorescent markers, the catalysts can be coded. Therefore, after cleavage of the tag from the polymer-coated resin, HPLC can be used to determine the pathway along which the products were formed.


Tetrahedron | 1999

Parallel solid-phase synthesis, screening, and encoding strategies for olefin-polymerization catalysts

Thomas R. Boussie; Vince Murphy; Keith A. Hall; Carla Coutard; Cameron G. Dales; Miroslav Petro; Eric D. Carlson; Howard W. Turner; Timothy Powers

Abstract A solid-phase protocol has been developed that allows for the parallel synthesis, screening, and chemical encoding of nickel (II) and palladium (II) olefin-polymerization catalysts. These catalysts display activity profiles comparable to the analogous homogeneous catalyst systems prepared by traditional methods. A chemical encoding strategy has also been developed which enables the chemical history of pooled solid-phase catalysts to be evaluated.


Angewandte Chemie | 1998

Festphasensynthese und Kodierung von Katalysatorbibliotheken für Olefinpolymerisationen

Thomas R. Boussie; Carla Coutard; Howard W. Turner; Vince Murphy; Timothy Powers

Aktive Polymerisationskatalysatoren sind die neuartigen, harzgebundenen Bisiminnickel(II)- und -palladium(II)-Komplexe, die durch kombinatorische Synthesen erhalten und zu einer Katalysatorbibliothek zusammengestellt wurden. Durch Einfugen von Fluoreszenzmarkern lassen sich die Katalysatoren kodieren, so das nach dem Abspalten der Marker vom polymerbeschichteten Harz HPL-chromatographisch zuruckverfolgt werden kann, nach welchem Syntheseverlauf die Produkte entstanden sind.


Angewandte Chemie | 1999

Combinatorial Materials Science and Catalysis

Bernd Jandeleit; Dieter J. Schaefer; Timothy Powers; Howard W. Turner; W. Henry Weinberg


Archive | 1997

Combinatorial synthesis and analysis of organometallic compounds and catalysts

W. Henry Weinberg; Eric W. McFarland; Isy Goldwasser; Thomas R. Boussie; Howard W. Turner; Johannes A. M. van Beek; Vince Murphy; Timothy Powers


Archive | 1999

Combinatorial synthesis and analysis of organometallic compounds and homogeneous catalysts

W. Henry Weinberg; Eric W. McFarland; Isy Goldwasser; Thomas R. Boussie; Howard W. Turner; Johannes A. M. van Beek; Vince Murphy; Timothy Powers


Archive | 1999

Substituted aminomethylphosphines, compositions and coordination complexes of same, their synthesis and processes using same

Anne M. Lapointe; Anil Guram; Timothy Powers; Bernd Jandeleit; Thomas R. Boussie; Cheryl Lund


Archive | 1999

Catalyst ligands, catalyst compositions, catalyst metal complexes and processes for cross-coupling aromatic boron compounds with aromatic halogens or perfluoroalkylsulfonates

Anil Guram; Xiaohong Bei; Timothy Powers; Bernd Jandeleit; Thomas Crevier

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