Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Przeglądasz jako GOŚĆ
Tytuł pozycji:

Chromium complexes based on thiophene–imine ligands for ethylene oligomerization.

Tytuł :
Chromium complexes based on thiophene–imine ligands for ethylene oligomerization.
Autorzy :
Ferreira, Jorge
Zilz, Raquel
Boeira, Igor S.
Silva, Sabrina M.
Casagrande, Adriana C.A.
Casagrande, Osvaldo L.
Pokaż więcej
Temat :
CHROMIUM compounds
METAL complexes
THIOPHENES
IMINES
LIGANDS
ETHYLENE
OLIGOMERIZATION
Źródło :
Applied Organometallic Chemistry; Mar2019, Vol. 33 Issue 3, pN.PAG-N.PAG, 1p
Czasopismo naukowe
A new set of Cr(III) complexes, {L}CrCl3(THF), based on thiophene–imine (2a, L = PhOC6H4(N═CH)‐2‐SC4H3; 2b, L = PhOC2H4(N═CH)‐2‐SC4H3; 2c, L = Ph(NH)C2H4(N═CH)‐2‐SC4H3; 2d, L = PhOC6H4(N═CH)‐2‐SC4H2‐5‐Ph; 2e, L = Ph(NH)C2H4(N═CH)‐2‐SC4H2‐5‐Ph) have been prepared and characterized using elemental analysis and infrared spectroscopy. Upon activation with methylaluminoxane, all the chromium complexes generated active systems affording a nonselective distribution of α‐olefins with turnover frequencies in the range 9500–93 500 (mol ethylene) (mol Cr)−1 h−1, and producing mostly oligomers (95.0–99.3 wt% of total products). Small amounts of polymer were produced in these oligomerization reactions (0.8–8.2 wt%). The catalytic activities were quite sensitive to the ligand environment. Moreover, the effects of oligomerization parameters (temperature, [Al]/[Cr] molar ratio, time) on the activity and on the product distribution were examined. A new set of Cr(III) complexes based on thiophene‐imine have been prepared. Upon activation with MAO, all the chromium complexes generated active systems affording a nonselective distribution of α‐olefins. Highlights: A new class of chromium precatalysts supported by thiophene–imine ligands with pendant N,O‐donor groups has been synthesized.The chromium precatalysts exhibit high selectivity for production of α‐olefins.The catalytic performance of the chromium precatalysts is strongly affected by the ligand environment.The thiophene–imine ligands have a significant effect on the K values and on the oligomer distributions. [ABSTRACT FROM AUTHOR]
Copyright of Applied Organometallic Chemistry is the property of John Wiley & Sons, Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Zaloguj się, aby uzyskać dostęp do pełnego tekstu.

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies