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Dive into the research topics where Hans H. Brintzinger is active.

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Featured researches published by Hans H. Brintzinger.


Journal of the American Chemical Society | 2010

Cationic Alkylaluminum-Complexed Zirconocene Hydrides as Participants in Olefin Polymerization Catalysis

Steven M. Baldwin; John E. Bercaw; Hans H. Brintzinger

The alkylaluminum-complexed zirconocene trihydride cation [(SBI)Zr(μ-H)(3)(Al(i)Bu(2))(2)](+), which is obtained by reaction of (SBI)ZrCl(2) with [Ph(3)C][B(C(6)F(5))(4)] and excess HAl(i)Bu(2) in toluene solution, catalyzes the formation of isotactic polypropene when exposed to propene at -30 °C. This cation remains the sole observable species in catalyst systems free of AlMe compounds. In the presence of AlMe(3), however, exposure to propene causes the trihydride cation to be completely converted, under concurrent consumption of all hydride species by propene hydroalumination, to the doubly Me-bridged cation [(SBI)Zr(μ-Me)(2)AlMe(2)](+). The latter then becomes the resting state for further propene polymerization, which produces, by chain transfer to Al, mainly AlMe(2)-capped isotactic polypropene.


Journal of the American Chemical Society | 2010

Reactive Intermediates Formed During Olefin Polymerization by Methylalumoxane-Activated ansa-Zirconocene Catalysts: Identification of a Chain-Carrying Intermediate by NMR Methods

Dmitrii E. Babushkin; Hans H. Brintzinger

Addition of 1-hexene to methylalumoxane-activated catalyst systems based on rac-Me(2)Si(ind)(2)ZrMe(2) causes, concurrent with polyhexene formation and diminution of the otherwise prevalent cation [rac-Me(2)Si(ind)(2)Zr(mu-Me)(2)AlMe(2)](+), formation of a hitherto unobserved species [rac-Me(2)Si(ind)(2)Zr(mu-R)(mu-Me)AlMe(2)](+), where R is a Zr-bound polyhexyl chain. As hexene is increasingly consumed, this cation decays, mainly back to [rac-Me(2)Si(ind)(2)Zr(mu-Me)(2)AlMe(2)](+) and, in part, to some species containing a Zr-bound allylic chain end.


Macromolecular Rapid Communications | 2015

Zirconium-allyl complexes as resting states in zirconocene-catalyzed α-olefin polymerization.

Valentina N. Panchenko; Dmitrii E. Babushkin; Hans H. Brintzinger

UV-vis spectroscopic data indicate that zirconocene cations with Zr-bound allylic chain ends are generally formed during olefin polymerization with zirconocene catalysts. The rates and extent of their formation and of their re-conversion to the initial pre-catalyst cations depend on the types of zirconocene complexes and activators used.


Journal of the American Chemical Society | 1971

Metastable form of titanocene : Formation from a hydride complex and reactions with hydrogen, nitrogen, and carbon monoxide

Hans H. Brintzinger; Robert H. Marvich


ChemInform | 2010

ansa-Metallocene Derivatives. Part 44. Asymmetric Thermal Transformation, a New Way to Enantiopure Biphenyl-Bridged Titanocene and Zirconocene Complexes: Efficient Catalysts for Asymmetric Imine Hydrogenation.

Markus Ringwald; Rainer Stuermer; Hans H. Brintzinger


Journal of the American Chemical Society | 1999

Asymmetric Thermal Transformation, a New Way to Enantiopure Biphenyl-Bridged Titanocene and Zirconocene Complexes: Efficient Catalysts for Asymmetric Imine Hydrogenation J. Am. Chem. Soc. 1999, 121, 1524−1527

Markus Ringwald; Rainer Stürmer; Hans H. Brintzinger


ChemInform | 1975

REACTIVITY PATTERNS OF CHROMOCENE, MOLYBDENOCENE, AND TUNGSTENOCENE REACTION SYSTEMS PART 1, CARBONYL COMPLEX FORMATION AS A PROBE OF COORDINATIVE UNSATURATION

Kit L. Tang Wong; Hans H. Brintzinger


ChemInform | 1975

REACTIVITY PATTERNS OF CHROMOCENE, MOLYBDENOCENE, AND TUNGSTENOCENE REACTION SYSTEMS PART 2, AN ANALYSIS IN TERMS OF MOLECULAR ORBITAL AND ELECTRON-ELECTRON REPULSION ENERGIES

Hans H. Brintzinger; Lawrence L. Lohr; Kit L. Tang Wong


ChemInform | 1974

IRON(II) AND IRON(III) IN THE TETRAHEDRAL SULFIDE ENVIRONMENT OF A GALLIUM SULFIDE HOST CRYSTAL

James V. Pivnichny; Hans H. Brintzinger


ChemInform | 1974

PHOTOGENERATION OF COORDINATIVELY UNSATURATED SANDWICH COMPOUNDS OF MOLYBDENUM AND TUNGSTEN FROM THEIR CARBONYL COMPLEXES

Kit L. Tang Wong; Joseph L. Thomas; Hans H. Brintzinger

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John E. Bercaw

California Institute of Technology

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