Structure of the Condensed Product of Aromatico-Aminonitrile with Carbonyl Compound and Its Mechanism

Amino alkylation of an acidic α-proton of a carbonyl by formaldehyde and a primary/secondary amine or ammonia, affording a β-amino-carbonyl compound also known as a Mannich base is a valuable reaction. We focus on recent advances in Zn catalysed Mannich reactions.

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Rhenium versus cadmium: an alternative structure for a thermally stable cadmium carbonyl compound

Chemical Science ◽

10.1039/d0sc04596a ◽

2020 ◽

Vol 11 (43) ◽

pp. 11763-11776

Author(s):

Erika Amemiya ◽

Aaron Loo ◽

Daniel G. Shlian ◽

Gerard Parkin

Keyword(s):

Carbonyl Compound ◽

Thermally Stable ◽

Rhenium Compound ◽

Alternative Structure

The previously reported novel cadmium carbonyl compound, [Cd(CO)3(C6H3Cl)]4, is better formulated as the rhenium compound, [Re(CO)3(C4N2H3S)]4.

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A METAL CARBONYL COMPOUND OF TITANIUM

Journal of the American Chemical Society ◽

10.1021/ja01512a062 ◽

1959 ◽

Vol 81 (3) ◽

pp. 752-753 ◽

Cited By ~ 31

Author(s):

James G. Murray

Keyword(s):

Carbonyl Compound ◽

Metal Carbonyl

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Apatite-staffelite ore flotation efficiency improvement using two-stage slurry thickening

Ores and metals ◽

10.47765/0869-5997-2021-10032 ◽

2022 ◽

pp. 121-131

Author(s):

Valery Morozov ◽

Polivanskaya Valeriya

Keyword(s):

Caustic Soda ◽

Liquid Glass ◽

Efficiency Improvement ◽

Selective Flocculation ◽

Two Stage ◽

Flotation Process ◽

Apatite Concentrate ◽

P2o5 Content ◽

Condensed Product ◽

Mode A

The studies were performed suggesting that the cause of P2O5 losses during apatite-staffelite ores (ASO) treatment are due to non-selective flocculation of fine classes during flotation. When using strong flocculants, special preparation of condensed slurries is necessary, ensuring their deflocculation before the flotation process. A scheme and mode of preparation of fine classes for the flotation process have been developed, including thickening of the classification overflows using strong anionic flocculants and deflocculation of the thickened product before the flotation process with reagents-dispersants used in the basic flotation mode. A mode of preparation of slimes of ASO ores for flotation is proposed, including thickening of the discharge of the classification operation using the anionic flocculant “Praestol-2540”, conditioning of the condensed product with additions of liquid glass and caustic soda in a ratio of 1 : 1, dilution and re-thickening of deflocculated slimes, consolidation and flotation thickened sludge and sand. The big laboratory tests have shown that the application of the developed regime provides a total increase in the extraction of P2O5 from ore from 70,1 to 71,5 % with an increase in the P2O5 content in apatite concentrate from 37,1 to 37,8 %, which makes the developed technology promising for processing refractory ASO at Kovdorsky GOK.

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Copper-Catalyzed Oxidative Self-Coupling of α-Amino Carbonyl Compounds for the Synthesis of Tetrasubstituted 1,4-Enediones

Synlett ◽

10.1055/s-0037-1611227 ◽

2018 ◽

Vol 29 (18) ◽

pp. 2422-2426

Author(s):

Bing Yi ◽

Jiannan Xiang ◽

Niannian Yi ◽

Yi Xiong ◽

Qingjun Huang ◽

...

Keyword(s):

Double Bond ◽

Carbonyl Compound ◽

Carbonyl Compounds ◽

Simultaneous Formation ◽

High Stereoselectivity

A protocol for the copper-catalyzed oxidative self-coupling of α-amino carbonyl compounds has been developed for the synthesis of tetrasubstituted 1,4-enediones (Z-isomers) in moderate to good yields through the cleavage of four sp3C–H bonds and the simultaneous formation of one C=C double bond in the α-amino carbonyl compound. The strategy has the advantages of using readily available starting materials and of high stereoselectivity.

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Thermodynamic simulation of oxidation process of the Moss-Mo3Si hypoeutectic alloy, doped with scandium or neodymium

Butlerov Communications ◽

10.37952/roi-jbc-01/19-57-2-90 ◽

2019 ◽

Vol 57 (2) ◽

pp. 90-100

Author(s):

Alexey V. Larionov ◽

◽

Ludmila Y. Udoeva ◽

Vladimir M. Chumarev ◽

◽

...

Keyword(s):

Oxidation Process ◽

Thermodynamic Simulation ◽

Oxidation Products ◽

Hypoeutectic Alloy ◽

Protective Film ◽

Chemical Transformations ◽

Reaction Products ◽

Moist Air ◽

Condensed Product ◽

Hsc Chemistry

In order to study the effect of yttrium additives on the oxidation of molybdenum silicide alloys, thermodynamic modeling of the interaction in Mo-Mo3Si-Sc5Si3 и Mo-Mo3Si-NdSi systems with dry and moist air was performed in the temperature range 25-2000 °C. The calculations were performed using the HSC Chemistry 6.12 software, into the database of which the calculated missing thermochemical characteristics silicates, molybdates of scandium and neodymium were entered. Based on the obtained dependences of the composition of phases on temperature and charge of the oxidant (air or vapor-air mixture), the sequence of phase formation was determined and the compositions of oxidation products were estimated. It is shown that, under equilibrium conditions, the oxidation process with dry and moist air proceeds almost equally, since the interaction of the components of the alloy with oxygen is thermodynamically preferable than with water vapor. According to the obtained thermodynamic models, the oxidation process of the Mo-5Si-3(Sc, Nd) (wt.%) alloys involves a sequence of the following chemical transformations: at the beginning Mo and Sc (Nd) silicides oxidize forming Sc2O3 ( Nd2O3), SiO2 and elemental Mo, then molybdenum is oxidized to MoO2 and Sc2O3 or Nd2O3 interacts with SiO2 with the formation of appropriate silicates Sc2Si2O7 или Nd2Si2O7. As a result of the complete oxidation of the alloy, MoO3 and Sc2(MoO4)3 or Nd2Mo4O15 are added to the condensed product, and molybdenum oxide (MoO3)n vapor appears in the gas phase. In addition, the formation of Nd2Mo2O7 and Nd2 (MoO4)3 is possible. During the oxidation of the Mo-5Si-3Nd alloy at T> 1700 oC, Nd(OH)3 can be formed in the condensed reaction products. According to the results of complete thermodynamic analysis, the formation of silicates and molybdates of scandium and neodymium can promote to the formation of a protective film on the surface of the alloys, which limits the diffusion of oxygen in them, and as a result, the oxidation resistance of alloys should increase.

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