Hans H. Brintzinger
University of Konstanz
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Hans H. Brintzinger.
Journal of the American Chemical Society | 2010
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
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
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
Hans H. Brintzinger; Robert H. Marvich
ChemInform | 2010
Markus Ringwald; Rainer Stuermer; Hans H. Brintzinger
Journal of the American Chemical Society | 1999
Markus Ringwald; Rainer Stürmer; Hans H. Brintzinger
ChemInform | 1975
Kit L. Tang Wong; Hans H. Brintzinger
ChemInform | 1975
Hans H. Brintzinger; Lawrence L. Lohr; Kit L. Tang Wong
ChemInform | 1974
James V. Pivnichny; Hans H. Brintzinger
ChemInform | 1974
Kit L. Tang Wong; Joseph L. Thomas; Hans H. Brintzinger