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.

New olefin metathesis catalysts bearing polyether clamp in N-heterocyclic carbenes ligands

Tetrahedron ◽  
2014 ◽  
Vol 70 (38) ◽  
pp. 6810-6816 ◽  
Author(s):  
Agnieszka Hryniewicka ◽  
Iwona Misztalewska ◽  
Dorota Czajkowska-Szczykowska ◽  
Zofia Urbańczyk-Lipkowska ◽  
Jacek W. Morzycki ◽  
...  
Keyword(s):  
Olefin Metathesis ◽  
Heterocyclic Carbenes ◽  
Metathesis Catalysts

Ruthenium olefin metathesis catalysts featuring unsymmetrical N-heterocyclic carbenes

2016 ◽  
Vol 45 (2) ◽  
pp. 561-571 ◽  
Author(s):  
Veronica Paradiso ◽  
Valerio Bertolasi ◽  
Chiara Costabile ◽  
Fabia Grisi
Keyword(s):  
Alkyl Group ◽  
Olefin Metathesis ◽  
Second Generation ◽  
Ruthenium Catalysts ◽  
Heterocyclic Carbenes ◽  
Metathesis Catalysts

New second generation ruthenium catalysts bearing unsymmetrical NHCs show different catalytic efficiencies depending on the size of the N-alkyl group (methyl or cyclohexyl) and on the backbone configuration.

ChemInform Abstract: New Olefin Metathesis Catalysts Bearing Polyether Clamp in N-Heterocyclic Carbenes Ligands.

ChemInform ◽  
2015 ◽  
Vol 46 (6) ◽  
pp. no-no
Author(s):  
Agnieszka Hryniewicka ◽  
Iwona Misztalewska ◽  
Dorota Czajkowska-Szczykowska ◽  
Zofia Urbanczyk-Lipkowska ◽  
Jacek W. Morzycki ◽  
...  
Keyword(s):  
Olefin Metathesis ◽  
Heterocyclic Carbenes ◽  
Metathesis Catalysts

scholarly journals Specialized Olefin Metathesis Catalysts Featuring Unsymmetrical N-Heterocyclic Carbene Ligands Bearing N-(Fluoren-9-yl) Arm

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 599 ◽  
Author(s):  
Phillip I. Jolly ◽  
Anna Marczyk ◽  
Paweł Małecki ◽  
Damian Trzybiński ◽  
Krzysztof Woźniak ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Olefin Metathesis ◽  
High Selectivity ◽  
State Of The Art ◽  
Heterocyclic Carbenes ◽  
Carbene Ligands ◽  
Structural Motifs ◽  
In Situ Generation ◽  
Metathesis Catalysts

Beneficial structural motifs from two known state-of-the-art olefin metathesis catalysts types, bearing unsymmetrical N-heterocyclic carbenes (uNHCs), were combined into a new hybridized design thereby translating the complementary beneficial reactivity demonstrated by their ‘parent’ complexes to the new N-fluorene derived olefin metathesis catalysts. Two chelating 2-iso-propoxy-benzylidene (Hoveyda-type) and two 3-phenyl-1H-inden-1-ylidene (indenylidene-type) complexes were successfully prepared by in situ generation of either the N′-mesityl (Mes) or N′-diisopropylphenyl (Dipp) derived uNHCs taking advantage of the thermal decomposition of the corresponding 2-(penta-fluorophenyl)-imidazolidines (NHC adducts). The new fluorene-derived catalysts mediate challenging olefin metathesis processes, such as α-olefin self-metathesis, with high selectivity and conversion.

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