Highly Active, Stable, and Selective Well-Defined Silica Supported Mo Imido Olefin Metathesis Catalysts

2007 ◽  
Vol 129 (5) ◽  
pp. 1044-1045 ◽  
Author(s):  
Frédéric Blanc ◽  
Jean Thivolle-Cazat ◽  
Jean-Marie Basset ◽  
Christophe Copéret ◽  
Adam S. Hock ◽  
...  
Keyword(s):  
Olefin Metathesis ◽  
Highly Active ◽  
Metathesis Catalysts

Merrifield resin-assisted routes to second-generation catalysts for olefin metathesis

2018 ◽  
Vol 8 (6) ◽  
pp. 1535-1544 ◽  
Author(s):  
Daniel L. Nascimento ◽  
Emma C. Davy ◽  
Deryn E. Fogg
Keyword(s):  
Olefin Metathesis ◽  
Second Generation ◽  
Highly Active ◽  
Merrifield Resin ◽  
Metathesis Catalysts

Phosphine-scavenging Merrifield resins can significantly facilitate the synthesis of highly active Ru metathesis catalysts, including the second-generation Grubbs, Hoveyda, and indenylidene catalysts (GII, HII, InII).

Avoiding rhenium loss in non-hydrolytic synthesis of highly active Re–Si–Al olefin metathesis catalysts

2015 ◽  
Vol 58 ◽  
pp. 183-186 ◽  
Author(s):  
Karim Bouchmella ◽  
Mariana Stoyanova ◽  
Uwe Rodemerck ◽  
Damien P. Debecker ◽  
P. Hubert Mutin
Keyword(s):  
Olefin Metathesis ◽  
Highly Active ◽  
Metathesis Catalysts

scholarly journals Olefin-surface interactions modulate the activity of silica-supported Mo-based olefin metathesis catalysts

2021 ◽  
Author(s):  
Zachariah Berkson ◽  
Moritz Bernhardt ◽  
Simon Schlapansky ◽  
Mathis Benedikter ◽  
Michael Buchmeiser ◽  
...  
Keyword(s):  
Chain Length ◽  
Olefin Metathesis ◽  
Active Sites ◽  
Reaction Rates ◽  
Catalytic Performance ◽  
Strong Activity ◽  
Oh Groups ◽  
Highly Active ◽  
Metathesis Catalysts ◽  
Internal Olefin

Molecularly defined and classical heterogenous Mo-based metathesis catalysts are shown to display distinct and unexpected reactivity patterns for the metathesis of long-chain α-olefins at low temperatures (< 100 °C). Namely, catalysts based on supported Mo oxo species, whether prepared via wet impregnation or surface organometallic chemistry (SOMC), exhibit strong activity dependencies on the α-olefin chain length, with slower reaction rates for longer substrate chain lengths. In contrast, molecular and supported Mo alkylidenes are highly active and do not display such dramatic dependence on chain length. 2D solid-state NMR analyses of post-metathesis catalysts, complemented by molecular dynamics calculations, evidence that the activity decrease observed for supported Mo oxo catalysts relates to the strong adsorption of internal olefin metathesis products due to interactions with surface Si-OH groups. Overall, this study shows that in addition to the nature and the number of active sites, the metathesis rates and overall catalytic performance depend on product desorption, even in the liquid phase with non-polar substrates. This study further highlights the need to consider adsorption when designing catalysts and the unique activity of molecularly defined supported metathesis catalysts prepared via SOMC.

Activated Hoveyda‐Grubbs Olefin Metathesis Catalysts Derived from a Large Scale Produced Pharmaceutical Intermediate—Sildenafil Aldehyde

2021 ◽  
Author(s):  
Louis Monsigny ◽  
Jakub Piątkowski ◽  
Damian Trzybiński ◽  
Krzysztof Wozniak ◽  
Tomasz Nienałtowski ◽  
...  
Keyword(s):  
Olefin Metathesis ◽  
Large Scale ◽  
Metathesis Catalysts

Nitrenium ions and trivalent boron ligands as analogues of N-heterocyclic carbenes in olefin metathesis: a computational study

2015 ◽  
Vol 44 (46) ◽  
pp. 20021-20026 ◽  
Author(s):  
A. Pazio ◽  
K. Woźniak ◽  
K. Grela ◽  
B. Trzaskowski
Keyword(s):  
Olefin Metathesis ◽  
Computational Study ◽  
Heterocyclic Carbenes ◽  
Mechanistic Study ◽  
Nitrenium Ions ◽  
Nitrenium Ion ◽  
Metathesis Catalysts

A DFT mechanistic study reveals that nitrenium ion-modified Hoveyda-like complexes are good candidates for latent metathesis catalysts, while boron-modified systems are candidates for very fast metathesis catalysts.

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