scholarly journals Magnesium hydrides bearing sterically demanding amidinate ligands: synthesis, reactivity and catalytic application

2020 ◽  
Vol 49 (32) ◽  
pp. 11354-11360
Author(s):  
Clare Bakewell
Keyword(s):  
Alkyl Complexes ◽  
Catalytic Application ◽  
Sterically Demanding ◽  
Magnesium Complexes ◽  
Magnesium Hydrides

The synthesis, characterisation and reactivity of a series of magnesium complexes bearing sterically demanding amidinate ligands is reported; this includes magneisum amides, hydrides and alkyl complexes.

Synthesis and catalytic application of magnesium complexes bearing pendant indolyl ligands

2015 ◽  
Vol 44 (20) ◽  
pp. 9610-9619 ◽  
Author(s):  
Kuo-Fu Peng ◽  
Yun Chen ◽  
Chi-Tien Chen
Keyword(s):  
Benzyl Alcohol ◽  
Cyclic Esters ◽  
Catalytic Application ◽  
Magnesium Complexes

A family of magnesium pendant indolyl complexes has been prepared and it exhibited high activities towards the ROP of cyclic esters in the presence of benzyl alcohol.

scholarly journals Synthesis and characterisation of magnesium complexes containing sterically demanding N,N′-bis(aryl)amidinate ligands

2014 ◽  
Vol 43 (12) ◽  
pp. 4838-4846 ◽  
Author(s):  
Graeme J. Moxey ◽  
Fabrizio Ortu ◽  
Leon Goldney Sidley ◽  
Helen N. Strandberg ◽  
Alexander J. Blake ◽  
...  
Keyword(s):  
Solid State ◽  
Sterically Demanding ◽  
Magnesium Complexes ◽  
Solution Behaviour

Reaction between N,N′-bis(aryl)amidines and di-n-butylmagnesium affords magnesium amidinates, where the steric bulk of the ligand influences both the solid state and solution behaviour of these complexes.

Reactivity of β-Diketiminato Magnesium Alkyl Complexes: Heterocumulenes and Phosphanes

2015 ◽  
Vol 68 (4) ◽  
pp. 635 ◽  
Author(s):  
Morgan J. Taylor ◽  
Martyn P. Coles ◽  
J. Robin Fulton
Keyword(s):  
Prolonged Exposure ◽  
Alkyl Complexes ◽  
Structural Details ◽  
Magnesium Complexes

Heteroleptic β-diketiminate/amidinate magnesium complexes {(BDI)Mg[MeC(NCy)2]} and {(BDI)Mg[BnC(NCy)2]} (Bn = CH2C6H5; BDI = {[N(2,6-iPr2C6H3)C(Me)]2CH}) were synthesised by treatment of [(BDI)MgR(THF)] (R = Me, Bn) with dicyclohexylcarbodiimide. Rare terminal magnesium phosphanide complexes [(BDI)Mg(PR′2)(THF)] (R′ = Cy, Ph) were synthesised through prolonged exposure of [(BDI)MgMe(THF)] with di-substituted phosphines. Spectroscopic and structural details of these complexes will be discussed.

Regioselective Gas-Phase n-Butane Transfer Dehydrogenation via Silica-Supported Pincer-Iridium Complexes

2020 ◽  
Author(s):  
Boris Sheludko ◽  
Cristina Castro ◽  
Chaitanya Khalap ◽  
Thomas Emge ◽  
Alan Goldman ◽  
...  
Keyword(s):  
Gas Phase ◽  
Active Site ◽  
Lower Cost ◽  
Open Systems ◽  
Iridium Complexes ◽  
Terminal Olefin ◽  
Molecular Precursors ◽  
Sterically Demanding ◽  
Olefin Production ◽  
Steam Cracking

<b>Abstract:</b> The production of olefins via on-purpose dehydrogenation of alkanes allows for a more efficient, selective and lower cost alternative to processes such as steam cracking. Silica-supported pincer-iridium complexes of the form [(≡SiO-<sup>R4</sup>POCOP)Ir(CO)] (<sup>R4</sup>POCOP = κ<sup>3</sup>-C<sub>6</sub>H<sub>3</sub>-2,6-(OPR<sub>2</sub>)<sub>2</sub>) are effective for acceptorless alkane dehydrogenation, and have been shown stable up to 300 °C. However, while solution-phase analogues of such species have demonstrated high regioselectivity for terminal olefin production under transfer dehydrogenation conditions at or below 240 °C, in open systems at 300 °C, regioselectivity under acceptorless dehydrogenation conditions is consistently low. In this work, complexes <a>[(≡SiO-<i><sup>t</sup></i><sup>Bu4</sup>POCOP)Ir(CO)] </a>(<b>1</b>) and [(≡SiO-<i><sup>i</sup></i><sup>Pr4</sup>PCP)Ir(CO)] (<b>2</b>) were synthesized via immobilization of molecular precursors. These complexes were used for gas-phase butane transfer dehydrogenation using increasingly sterically demanding olefins, resulting in observed selectivities of up to 77%. The results indicate that the active site is conserved upon immobilization.

Monodentate Trialkylphosphines: Privileged Ligands in Metal-catalyzed Crosscoupling Reactions

2020 ◽  
Vol 24 (3) ◽  
pp. 231-264 ◽  
Author(s):  
Kevin H. Shaughnessy
Keyword(s):  
Transition Metal ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Cross Coupling Reactions ◽  
Aryl Bromides ◽  
Wide Range ◽  
Sterically Demanding ◽  
Transition Metal Catalyzed ◽  
Catalyzed Reactions ◽  
Metal Catalyzed

Phosphines are widely used ligands in transition metal-catalyzed reactions. Arylphosphines, such as triphenylphosphine, were among the first phosphines to show broad utility in catalysis. Beginning in the late 1990s, sterically demanding and electronrich trialkylphosphines began to receive attention as supporting ligands. These ligands were found to be particularly effective at promoting oxidative addition in cross-coupling of aryl halides. With electron-rich, sterically demanding ligands, such as tri-tertbutylphosphine, coupling of aryl bromides could be achieved at room temperature. More importantly, the less reactive, but more broadly available, aryl chlorides became accessible substrates. Tri-tert-butylphosphine has become a privileged ligand that has found application in a wide range of late transition-metal catalyzed coupling reactions. This success has led to the use of numerous monodentate trialkylphosphines in cross-coupling reactions. This review will discuss the general properties and features of monodentate trialkylphosphines and their application in cross-coupling reactions of C–X and C–H bonds.

Catalytic Application of Mesoporous ZSM-5 Zeolite

2014 ◽  
Vol 18 (10) ◽  
pp. 1305-1322 ◽  
Author(s):  
Zheng Wu ◽  
Yi Wang
Keyword(s):  
Catalytic Application

cis-Dioxomolybdenum(VI) Complexes Containing Chiral Ligands: Synthesis and Catalytic Application in Olefin Epoxidation

2011 ◽  
Vol 1 (2) ◽  
pp. 131-139 ◽  
Author(s):  
Jose A. Brito ◽  
Nathalie Saffon ◽  
Montserrat Gomez ◽  
Beatriz Royo
Keyword(s):  
Chiral Ligands ◽  
Olefin Epoxidation ◽  
Catalytic Application
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