Towards Highly Active and Robust Alkyne Metathesis Catalysts: Recent Developments in Catalyst Design

2011 ◽  
Vol 50 (37) ◽  
pp. 8478-8480 ◽  
Author(s):  
Kuthanapillil Jyothish ◽  
Wei Zhang
Keyword(s):  
Catalyst Design ◽  
Alkyne Metathesis ◽  
Highly Active ◽  
Recent Developments ◽  
Metathesis Catalysts

scholarly journals Recent advances in the development of alkyne metathesis catalysts

2011 ◽  
Vol 7 ◽  
pp. 82-93 ◽  
Author(s):  
Xian Wu ◽  
Matthias Tamm
Keyword(s):  
Alkyne Metathesis ◽  
Highly Active ◽  
Recent Advances ◽  
Metathesis Reactions ◽  
Metathesis Catalysts ◽  
And Tungsten

The number of well-defined molybdenum and tungsten alkylidyne complexes that are able to catalyze alkyne metathesis reactions efficiently has been significantly expanded in recent years.The latest developments in this field featuring highly active imidazolin-2-iminato- and silanolate–alkylidyne complexes are outlined in this review.

scholarly journals Efficient catalytic alkyne metathesis with a fluoroalkoxy-supported ditungsten(III) complex

2018 ◽  
Vol 14 ◽  
pp. 2425-2434 ◽  
Author(s):  
Henrike Ehrhorn ◽  
Janin Schlösser ◽  
Dirk Bockfeld ◽  
Matthias Tamm
Keyword(s):  
Metal Complexes ◽  
The Self ◽  
Significant Activity ◽  
Terminal Alkynes ◽  
Alkyne Metathesis ◽  
Cross Metathesis ◽  
Tungsten Complexes ◽  
Highly Active ◽  
Metathesis Catalysts ◽  
And Tungsten

The molybdenum and tungsten complexes M2(OR)6 (Mo2F6, M = Mo, R = C(CF3)2Me; W2F3, M = W, R = OC(CF3)Me2) were synthesized as bimetallic congeners of the highly active alkyne metathesis catalysts [MesC≡M{OC(CF3) n Me3− n }] (MoF6, M = Mo, n = 2; WF3, M = W, n = 1; Mes = 2,4,6-trimethylphenyl). The corresponding benzylidyne complex [PhC≡W{OC(CF3)Me2}] (W Ph F3) was prepared by cleaving the W≡W bond in W2F3 with 1-phenyl-1-propyne. The catalytic alkyne metathesis activity of these metal complexes was determined in the self-metathesis, ring-closing alkyne metathesis and cross-metathesis of internal and terminal alkynes, revealing an almost equally high metathesis activity for the bimetallic tungsten complex W2F3 and the alkylidyne complex W Ph F3. In contrast, Mo2F6 displayed no significant activity in alkyne metathesis.

scholarly journals Highly active alkyne metathesis catalysts operating under open air condition

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yanqing Ge ◽  
Shaofeng Huang ◽  
Yiming Hu ◽  
Lei Zhang ◽  
Ling He ◽  
...  
Keyword(s):  
Catalyst System ◽  
Alkyne Metathesis ◽  
Ambient Conditions ◽  
High Moisture ◽  
Highly Active ◽  
Active User ◽  
Metathesis Catalyst ◽  
Cyano Groups ◽  
Metathesis Catalysts ◽  
User Friendly

AbstractAlkyne metathesis represents a rapidly emerging synthetic method that has shown great potential in small molecule and polymer synthesis. However, its practical use has been impeded by the limited availability of user-friendly catalysts and their generally high moisture/air sensitivity. Herein, we report an alkyne metathesis catalyst system that can operate under open-air conditions with a broad substrate scope and excellent yields. These catalysts are composed of simple multidentate tris(2-hydroxyphenyl)methane ligands, which can be easily prepared in multi-gram scale. The catalyst substituted with electron withdrawing cyano groups exhibits the highest activity at room temperature with excellent functional group tolerance (-OH, -CHO, -NO2, pyridyl). More importantly, the catalyst provides excellent yields (typically >90%) in open air, comparable to those operating under argon. When dispersed in paraffin wax, the active catalyst can be stored on a benchtop under ambient conditions without any decrease in activity for one day (retain 88% after 3 days). This work opens many possibilities for developing highly active user-friendly alkyne metathesis catalysts that can function in open air.

ChemInform Abstract: Highly Active Multidentate Ligand-Based Alkyne Metathesis Catalysts.

ChemInform ◽  
2016 ◽  
Vol 47 (43) ◽  
Author(s):  
Ya Du ◽  
Haishen Yang ◽  
Chengpu Zhu ◽  
Michael Ortiz ◽  
Kenji D. Okochi ◽  
...  
Keyword(s):  
Alkyne Metathesis ◽  
Multidentate Ligand ◽  
Highly Active ◽  
Metathesis Catalysts

Preparation of Imidazolin-2-iminato Molybdenum and Tungsten Benzylidyne Complexes: A New Pathway to Highly Active Alkyne Metathesis Catalysts

2010 ◽  
Vol 16 (29) ◽  
pp. 8868-8877 ◽  
Author(s):  
Birte Haberlag ◽  
Xian Wu ◽  
Kai Brandhorst ◽  
Jörg Grunenberg ◽  
Constantin G. Daniliuc ◽  
...  
Keyword(s):  
Alkyne Metathesis ◽  
Highly Active ◽  
Metathesis Catalysts ◽  
And Tungsten
Sign in / Sign up

Export Citation Format

Share Document