American Chemical Society (ACS)
Organometallics
,  том 35 ,  издание 17 ,  страницы 2836-2839

Termination Events in Sterically Hindered Metallocene-Catalyzed Olefin Oligomerizations: Vinyl Chain Ends in Oligooctenes

Тип публикации: Journal Article
Дата публикации: 2016-08-16
American Chemical Society (ACS)
scimago Q2
wos Q1
БС1
SJR: 0.676
CiteScore: 5.1
Impact factor: 2.9
ISSN: 02767333, 15206041
Organic Chemistry
Inorganic Chemistry
Physical and Theoretical Chemistry
Краткое описание
Sterically hindered rac-dimethylsilylbis(2-methyl-3-propylindenyl)hafnium dimethyl (1) activated with dimethylanilinium tetrakis(perfluoronaphthylborate) (2) gave high levels of allylic chain ends in the oligomerization of higher α-olefins such as 1-octene. Solution oligomerization of 1-octene in hexanes yielded atactic macromers with roughly 60 mol % vinyl termination and lesser amounts of trisubstituted (25%) and vinylidene (20%) termination. To further probe the mechanism of elimination, oligomerization with 1-octene (1-13C) was performed and the label distribution determined by 13C NMR spectroscopy. Enhancement of the methylene (H2C═C−) vinyl resonance was observed, supporting β-hexyl elimination as a possible mechanistic step and ruling out allylic formation by a chain-walking mechanism prevalent in late-transition-metal systems.
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Brant P. et al. Termination Events in Sterically Hindered Metallocene-Catalyzed Olefin Oligomerizations: Vinyl Chain Ends in Oligooctenes // Organometallics. 2016. Vol. 35. No. 17. pp. 2836-2839.
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Brant P., Jiang P., Lovell J., Crowther D. Termination Events in Sterically Hindered Metallocene-Catalyzed Olefin Oligomerizations: Vinyl Chain Ends in Oligooctenes // Organometallics. 2016. Vol. 35. No. 17. pp. 2836-2839.
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TY - JOUR
DO - 10.1021/acs.organomet.6b00409
UR - https://doi.org/10.1021/acs.organomet.6b00409
TI - Termination Events in Sterically Hindered Metallocene-Catalyzed Olefin Oligomerizations: Vinyl Chain Ends in Oligooctenes
T2 - Organometallics
AU - Brant, Patrick
AU - Jiang, Peijun
AU - Lovell, Jacqueline
AU - Crowther, Donna
PY - 2016
DA - 2016/08/16
PB - American Chemical Society (ACS)
SP - 2836-2839
IS - 17
VL - 35
SN - 0276-7333
SN - 1520-6041
ER -
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@article{2016_Brant,
author = {Patrick Brant and Peijun Jiang and Jacqueline Lovell and Donna Crowther},
title = {Termination Events in Sterically Hindered Metallocene-Catalyzed Olefin Oligomerizations: Vinyl Chain Ends in Oligooctenes},
journal = {Organometallics},
year = {2016},
volume = {35},
publisher = {American Chemical Society (ACS)},
month = {aug},
url = {https://doi.org/10.1021/acs.organomet.6b00409},
number = {17},
pages = {2836--2839},
doi = {10.1021/acs.organomet.6b00409}
}
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Brant, Patrick, et al. “Termination Events in Sterically Hindered Metallocene-Catalyzed Olefin Oligomerizations: Vinyl Chain Ends in Oligooctenes.” Organometallics, vol. 35, no. 17, Aug. 2016, pp. 2836-2839. https://doi.org/10.1021/acs.organomet.6b00409.