Preparation of tungsten-based olefin metathesis catalysts supported on alumina

Content Provider	Semantic Scholar
Author	Yuan, Jian Townsend, Erik M. Schrock, Richard R. Goldman, Alan S. Müller, Peter Takase, Michael K.
Copyright Year	2011
Abstract	A new tungsten alkylidene complex, W(NAr)(CHCMe2Ph)(OHIPT-NMe2)(pyrrolide) {Ar=2,6-(i-Pr)2C6H3; HIPT-NMe2=2,6-[2,4,6-(i-Pr)3C6H2]2-4-NMe2-C6H2}, has been synthesized and shown to be highly selective for Z homocoupling metathesis of selected terminal olefins in pentane, as is W(NAr)(CH2CH2CH2)(OHIPT)(pyrrolide) (5). Both 5 and W(NAr)(CHCMe2Ph)(OHIPT-NMe2)(pyrrolide) (6) are adsorbed onto calcined alumina. Control experiments and metathesis homocoupling of four substrates lead to the conclusions that 5 is largely adsorbed in a reaction that liberates HIPTOH, while 6 is adsorbed largely through an interaction between the dimethylamino group and an acidic site on the surface. There is no evidence that any adsorbed catalyst can give rise to Z selectivity of a magnitude equal to that found in a homogeneous reaction involving 5 or 6.
Starting Page	1985
Ending Page	1992
Page Count	8
File Format	PDF HTM / HTML
DOI	10.1002/adsc.201100200
Alternate Webpage(s)	http://web.mit.edu/pmueller/www/own_papers/yuan_etal_2011.pdf
Alternate Webpage(s)	https://doi.org/10.1002/adsc.201100200
Volume Number	353
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article