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PRODID:https://murmitoyen.com/events/vanille/udem/
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UID:69e0869ada0fb
DTSTAMP:20260416T025002
DTSTART:20131107T110000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20131107T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/322510
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Conférence du Professeur Scott Collins (Victoria)
DESCRIPTION:Titre : Methylaluminoxane Activation of Single-Site Polymerizat
 ion Catalysts: Friend or Foe?La conférence (en anglais) sera prononcée p
 ar le professeur Scott Collins\, qui est actuellement un chercheur invité
  au département de chimie de l'University of Victoria. Ce dernier sera de
  passage à Montréal à titre d'examinateur externe d'une soutenance de t
 hèse en chimie. Résumé : Ever since its discovery in the 1970s by Sinn
  and Kaminsky\, methylaluminoxane (MAO) has been the activator of choice f
 or transition metal complexes that give rise to single-site polymerization
  catalysts which affect the coordination-insertion polymerization of simpl
 e alkenes to furnish polyolefins.In the case of bent metallocene or constr
 ained geometry\, cyclopentadienylamido complexes of group 4\, this technol
 ogy forms the basis for a variety of commercial processes that account for
  more than 10% of global production of polyolefins each year. Despite the 
 success of this new technology\, MAO is typically used in large excess ove
 r the transition metal complex and represents a significant fraction of th
 e total cost of the catalyst. Moreover\, despite intensive study\, the str
 uctures and functions of this complex mixture of organoaluminum compounds 
 remains a mystery to this day.In this presentation we will review the curr
 ent understanding of MAO and its mode(s) of action\, and illustrate some o
 f the unusual or unexpected aspects of its behavior with reference to a nu
 mber of projects we have been involved with over the years\, both in Canad
 a and elsewhere.These studies hint that MAO is not always the activator of
  choice when one moves away from metallocene complexes of group 4 and in f
 act its use may be quite misleading in certain cases as to transition meta
 l catalyst structure and function. In the final part of our presentation\,
  we will discuss recent electrospray ionization mass spectrometric studies
 as well as conventional techniques such as NMR spectroscopythat make clear
  how MAO activates metallocene complexes\, and why this chemical “chamel
 eon” behaves in the unique fashion it does.Information supplémentaire
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TZID:America/Montreal
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