Perfectly Green Organocatalysis: Quaternary Ammonium Base Triggered Cyanosilylation of Aldehydes

Abstract The problem of e-waste processing and recovery of valuable metals from such waste for the second use is attracting more and more scientists’ attention. Liquid extraction as one of hydrometallurgy steps is a traditional method for the metal recovery. However, application of solvent extraction is not meet the green chemistry principles due to organic solvents. Aqueous two-phase systems based on water-soluble polymers are promising alternative for hazardous organic solvents. In this work the dependencies of Ce(III) and La(III) distribution coefficients from process time and the initial quaternary ammonium base concentration have been achieved. Also, based on the Ce(III) and La(III) extraction isotherms it has been shown that the metals initial concentrations are highly affects the distribution coefficients of studied metals. The possibility of aqueous two-phase system application as a solvent for quaternary ammonium salt for light REE (Ce(III) and La(III)) extraction from water solution has been shown.

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Study on the methanolysis of natural lecithin catalyzed by quaternary ammonium base resin

Reaction Kinetics Mechanisms and Catalysis ◽

10.1007/s11144-012-0471-z ◽

2012 ◽

Vol 107 (2) ◽

pp. 345-354 ◽

Cited By ~ 3

Author(s):

Hongya Li ◽

Xiaoli Zhang ◽

Tiantian Zhang ◽

Kunkun Dou ◽

Binxia Zhao

Keyword(s):

Quaternary Ammonium ◽

Quaternary Ammonium Base ◽

Base Resin

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Silicate Fiberglasses Modified with Quaternary Ammonium Base for Natural Gas Desulfurization

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.7b01389 ◽

2017 ◽

Vol 56 (37) ◽

pp. 10318-10328 ◽

Cited By ~ 4

Author(s):

Bair S. Bal’zhinimaev ◽

Evgenii V. Kovalyov ◽

Alexei P. Suknev ◽

Eugenii A. Paukshtis ◽

Dzhalil F. Khabibulin ◽

...

Keyword(s):

Natural Gas ◽

Quaternary Ammonium ◽

Quaternary Ammonium Base ◽

Natural Gas Desulfurization

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New and Uncommon Indole- and Imidazole-Alkylamines in Skins of Amphibians from Australia and Papua New Guinea

Zeitschrift für Naturforschung C ◽

10.1515/znc-1976-3-403 ◽

1976 ◽

Vol 31 (3-4) ◽

pp. 118-120 ◽

Cited By ~ 11

Author(s):

M. Roseghini ◽

R. Endean ◽

A. Temperilli

Keyword(s):

Papua New Guinea ◽

Quaternary Ammonium ◽

Aromatic Amines ◽

New Guinea ◽

Rich Source ◽

South American ◽

Amphibian Skin ◽

Quaternary Ammonium Base

Abstract Extracts of the skin of some amphibians from Australia and Papua New Guinea contained, in addition to the usual 5-hydroxyindolealkylamines and histamine: a. two new, hitherto unknown indolealkylamines, i.e . O-sulphate of bufotenidine and 2-(3-indolyl)ethyltrimethylammonium, a quaternary ammonium base of tryptamine. The rare O-sulphate of bufotenine was also present, the occurrence of which had previously been demonstrated only in the skin of some South American toads; b. a series of uncommon imidazolealkylamines, such as N′-acetylhistamine, N′-methyl-histamine, N′,N′-dimethylhistamine, spinaceamine and 6-methylspinaceamine. It appears evident that amphibian skin continues to be an exceptionally rich source of aromatic amines.

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Preparation and catalytic performance of quaternary ammonium base resin for methanolysis of natural phosphatidylcholine

Chemical Papers ◽

10.1515/chempap-2016-0023 ◽

2016 ◽

Vol 70 (6) ◽

Author(s):

Hong-Ya Li ◽

Xiao-Li Zhang ◽

Biao Yan ◽

Bin-Xia Zhao ◽

Jing Gao

Keyword(s):

Quaternary Ammonium ◽

Carbon Chain ◽

Catalytic Performance ◽

Exchange Capacity ◽

Polystyrene Microspheres ◽

Quaternary Ammonium Base ◽

Factors Affecting ◽

Base Resin ◽

Acceptable Method ◽

Homogeneous Catalytic Process

AbstractReceived 1 August 2015; Revised 23 November 2015; Accepted 26 November 2015The most acceptable method for preparing glycerophosphocholine is to hydrolyse the natural phosphatidylcholine and use the quaternary ammonium base resin, as a promising heterogeneous catalyst can simplify the craft and minimise the problems existing in the homogeneous catalytic process. However, most of the resins reported in the literature are commercial trimethyl benzyl ammonium base resins and the application of other longer carbon-chain quaternary ammonium resins has not been reported. In the present work, a series of quaternary ammonium base resins were prepared from chloromethyl polystyrene microspheres and different tertiary amines and were used to prepare glycerophosphocholine from natural phosphatidylcholine. The factors affecting the exchange capacity and activity of the resin were investigated. The results showed that the resin possessed a better activity and stability under the following conditions: 1,4-dioxane as solvent, triethylamine as amination agent, reaction temperature of 60°C and amination time of 3 h; it was then used in the methanolysis of phosphatidylcholine by ultrasound-assisted reaction at ambient temperature, with the conversion of phosphatidylcholine attaining 97 % after 4 h. The catalyst was easy to separate from the reaction mixture and could also be readily available for repeat use; the activity and stability were largely consistent after six repeat uses.

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