scholarly journals Manganese catalyzed selective hydrogenation of cyclic imides to diols and amines

2020 ◽  
Vol 22 (10) ◽  
pp. 3079-3082 ◽  
Author(s):  
Uttam Kumar Das ◽  
Trevor Janes ◽  
Amit Kumar ◽  
David Milstein
Keyword(s):  
Selective Hydrogenation ◽  
Pincer Complex ◽  
Earth Abundant ◽  
Cyclic Imides ◽  
First Time

Herein we report the selective hydrogenation of cyclic imides to diols and amines, homogeneously catalyzed for the first time by a complex of an earth-abundant metal, a manganese pincer complex.

scholarly journals Highly selective hydrogenation of amides catalysed by a molybdenum pincer complex: scope and mechanism

2019 ◽  
Vol 10 (45) ◽  
pp. 10566-10576 ◽  
Author(s):  
Thomas Leischner ◽  
Lluis Artús Suarez ◽  
Anke Spannenberg ◽  
Kathrin Junge ◽  
Ainara Nova ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Selective Hydrogenation ◽  
Pincer Complexes ◽  
Pincer Complex ◽  
First Time

A series of molybdenum pincer complexes has been shown for the first time to be active in the catalytic hydrogenation of amides.

Selective Hydrogenation of Nitriles to Primary Amines Catalyzed by a Cobalt Pincer Complex

2015 ◽  
Vol 137 (28) ◽  
pp. 8888-8891 ◽  
Author(s):  
Arup Mukherjee ◽  
Dipankar Srimani ◽  
Subrata Chakraborty ◽  
Yehoshoa Ben-David ◽  
David Milstein
Keyword(s):  
Selective Hydrogenation ◽  
Primary Amines ◽  
Pincer Complex ◽  
Hydrogenation Of Nitriles

Facile preparation of semimetallic WP2 as a novel photocatalyst with high photoactivity

RSC Advances ◽  
2016 ◽  
Vol 6 (19) ◽  
pp. 15724-15730 ◽  
Author(s):  
Mingyu Pi ◽  
Tianli Wu ◽  
Dingke Zhang ◽  
Shijian Chen ◽  
Shuxia Wang
Keyword(s):  
Micro Particles ◽  
Considerable Research ◽  
Earth Abundant ◽  
Facile Preparation ◽  
First Time

Searching for inexpensive and earth-abundant photocatalysts with high activities has attracted considerable research in recent years. Semimetallic tungsten diphosphide (WP2) micro-particles are explored as a novel photocatalyst at the first time.

Controlled synthesis of Co3O4@NiMoO4 core–shell nanorod arrays for efficient water splitting

2018 ◽  
Vol 47 (35) ◽  
pp. 12071-12074 ◽  
Author(s):  
Xiaoqiang Du ◽  
Nai Li ◽  
Xiaoshuang Zhang
Keyword(s):  
Water Splitting ◽  
Nickel Foam ◽  
Core Shell ◽  
Controlled Synthesis ◽  
Nanorod Arrays ◽  
Earth Abundant ◽  
First Time

We reported for the first time the development of Co3O4@NiMoO4 nanorod arrays on nickel foam (Co3O4@NiMoO4/NF) as a robust Earth-abundant electrocatalyst for water splitting.

Selective hydrogenation of nitriles to primary amines catalyzed by a novel iron complex

2016 ◽  
Vol 52 (9) ◽  
pp. 1812-1815 ◽  
Author(s):  
Subrata Chakraborty ◽  
Gregory Leitus ◽  
David Milstein
Keyword(s):  
Selective Hydrogenation ◽  
Iron Complex ◽  
Primary Amines ◽  
Homogeneous Hydrogenation ◽  
Earth Abundant ◽  
Novel Complex ◽  
Aliphatic Nitriles ◽  
Hydrogenation Of Nitriles

A novel complex based on earth-abundant iron, and its application in the catalytic homogeneous hydrogenation of (hetero)aromatic, benzylic, and aliphatic nitriles to selectively form primary amines is discovered.

Heterogeneous selective hydrogenation of ethylene carbonate to methanol and ethylene glycol over a copper chromite nanocatalyst

2015 ◽  
Vol 51 (7) ◽  
pp. 1252-1254 ◽  
Author(s):  
Chao Lian ◽  
Fumin Ren ◽  
Yuxi Liu ◽  
Guofeng Zhao ◽  
Yongjun Ji ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Selective Hydrogenation ◽  
Industrial Application ◽  
Ethylene Carbonate ◽  
Copper Chromite ◽  
First Time ◽  
Hydrogenation Of Ethylene

Heterogeneous selective hydrogenation of ethylene carbonate to methanol and ethylene glycol, which provides an opportunity for industrial application of CO2 indirect conversion, was achieved for the first time over a copper chromite nanocatalyst.

scholarly journals Selective Manganese-Catalyzed Dimerization and Cross-Coupling of Terminal Alkynes

2021 ◽  
Author(s):  
Stefan Weber ◽  
Luis F. Veiros ◽  
Karl Kirchner
Keyword(s):  
Dft Calculations ◽  
Precious Metal ◽  
Bond Cleavage ◽  
Cross Coupling ◽  
Metal Catalyst ◽  
Catalyst Loading ◽  
Terminal Alkynes ◽  
Migratory Insertion ◽  
Earth Abundant ◽  
First Time

<div>For the first time, an efficient manganese-catalyzed dimerization of terminal alkynes to afford 1,3-enynes is described. This reaction is atom economic, implementing an inexpensive, earth abundant non-precious metal catalyst. The pre-catalyst is the bench-stable alkyl bisphosphine Mn(I) complex fac-[Mn(dippe)(CO)3(CH2CH2CH3)]. The catalytic process is initiated by migratory insertion of a CO ligand into the Mn-alkyl bond to yield an acyl intermediate which undergoes rapid C-H bond cleavage of the alkyne forming an active Mn(I) acetylide catalyst [Mn(dippe)(CO)2(C≡CPh)(η2-HC≡CPh)] together with liberated butanal. A range of aromatic and aliphatic terminal alkynes were efficiently and selectively converted into head-to-head Z-1,3-enynes and head-to-tail gem-1,3-enynes, respectively, in good to excellent yields. Moreover, cross-coupling of aromatic and aliphatic alkynes yields selectively head-to-tail gem-1,3-enynes. In all cases, the reactions were performed at 70 °C with a catalyst loading of 1-2 mol %. A mechanism based on DFT calculations is presented.</div><div><br></div>

scholarly journals Selective Manganese-Catalyzed Dimerization and Cross-Coupling of Terminal Alkynes

2021 ◽  
Author(s):  
Stefan Weber ◽  
Luis F. Veiros ◽  
Karl Kirchner
Keyword(s):  
Dft Calculations ◽  
Precious Metal ◽  
Bond Cleavage ◽  
Cross Coupling ◽  
Metal Catalyst ◽  
Catalyst Loading ◽  
Terminal Alkynes ◽  
Migratory Insertion ◽  
Earth Abundant ◽  
First Time

<div>For the first time, an efficient manganese-catalyzed dimerization of terminal alkynes to afford 1,3-enynes is described. This reaction is atom economic, implementing an inexpensive, earth abundant non-precious metal catalyst. The pre-catalyst is the bench-stable alkyl bisphosphine Mn(I) complex fac-[Mn(dippe)(CO)3(CH2CH2CH3)]. The catalytic process is initiated by migratory insertion of a CO ligand into the Mn-alkyl bond to yield an acyl intermediate which undergoes rapid C-H bond cleavage of the alkyne forming an active Mn(I) acetylide catalyst [Mn(dippe)(CO)2(C≡CPh)(η2-HC≡CPh)] together with liberated butanal. A range of aromatic and aliphatic terminal alkynes were efficiently and selectively converted into head-to-head Z-1,3-enynes and head-to-tail gem-1,3-enynes, respectively, in good to excellent yields. Moreover, cross-coupling of aromatic and aliphatic alkynes yields selectively head-to-tail gem-1,3-enynes. In all cases, the reactions were performed at 70 °C with a catalyst loading of 1-2 mol %. A mechanism based on DFT calculations is presented.</div><div><br></div>

Secondary phosphine oxides stabilized Au/Pd nanoalloys: metal components-controlled regioselective hydrogenation toward phosphinyl (Z)-[3]dendralenes

2019 ◽  
Vol 55 (78) ◽  
pp. 11699-11702 ◽  
Author(s):  
Yun-Tao Xia ◽  
Xiao-Yu Xie ◽  
Su-Hang Cui ◽  
Yi-Gang Ji ◽  
Lei Wu
Keyword(s):  
Selective Hydrogenation ◽  
Secondary Phosphine ◽  
Phosphine Oxides ◽  
First Time

A series of gold/palladium nanoalloys stabilized by secondary phosphine oxides have been prepared and applied in selective hydrogenation for the first time.

Iron-Catalyzed C—H Insertions: Organometallic and Enzymatic Carbene Transfer Reactions

2018 ◽  
Author(s):  
Katharina J. Hock ◽  
Anja Knorrscheidt ◽  
Renè Hommelsheim ◽  
Junming Ho ◽  
Martin J. Weissenborn ◽  
...  
Keyword(s):  
Iron Reduction ◽  
Kinetic Isotope Effect ◽  
Heme Iron ◽  
Transfer Reactions ◽  
Deuterium Labeling ◽  
Reaction Conditions ◽  
Kinetic Isotope ◽  
Earth Abundant ◽  
First Time ◽  
Iron Based Catalysts

<p>C—H insertion reactions with organometallic and enzymatic catalysts based on earth-abundant iron complexes remain one of the major challenges in organic synthesis. In this report, we describe the development and application of these iron-based catalysts in the reaction of two different carbene precursors with <i>N-</i>heterocycles for the first time. While FeTPPCl showed excellent reactivity in the Fe(III) state with diazoacetonitrile, the highest activities of the YfeX enzyme could be achieved upon heme-iron reduction to Fe(II) with both diazoacetonitrile and ethyl diazoacetate. This highlights unexpected and subtle differences in reactivity of both iron catalysts. Deuterium labeling studies indicated a C—H insertion pathway and a marked kinetic isotope effect. This transformation features mild reaction conditions, excellent yields or turnover numbers with broad functional group tolerance, including gram-scale applications giving a unique access to functionalized <i>N</i>-heterocycles.</p>

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