Effect of Polymethylene Chain Length of 4‐Acylbis(1‐phenyl‐3‐methyl‐5‐pyrazolones) on the Extraction of Vanadium(V): Synergistic Effect with Neutral Organophosphorus Extractants

2005 ◽  
Vol 23 (4) ◽  
pp. 501-518 ◽  
Author(s):  
P. N. Remya ◽  
Rani Pavithran ◽  
M. L. P. Reddy
Keyword(s):  
Synergistic Effect ◽  
Chain Length ◽  
Polymethylene Chain ◽  
Organophosphorus Extractants

Influence of Layer Charge and Modifier on Wettability of Organo-Montmorillonite

2014 ◽  
Vol 1030-1032 ◽  
pp. 90-94
Author(s):  
Zhong Xin Luo ◽  
Mang Lai Gao ◽  
Ya Ge Ye
Keyword(s):  
Synergistic Effect ◽  
Chain Length ◽  
Quaternary Ammonium ◽  
Capillary Rise ◽  
Quaternary Ammonium Salts ◽  
Deionized Water ◽  
Ammonium Salts ◽  
Layer Charge ◽  
Oil Reservoir ◽  
Capillary Rise Method

To study the influence of layer charge and modifier on wettability plays an important role on the diagnosis of oil reservoir. In this paper, two quaternary ammonium salts (QASs) with different chain-length were used singularly or in compound form to modify the reduced-charge montmorillonites (RCMs). The wettability alterations of the organo-RCMs for deionized water and cyclohexane were studied based on capillary rise method. The results showed that RCMs singularly modified by QASs show different wettability characteristics. Moreover, there is a synergistic effect on the wettability when the RCMs are compound modified by two QASs and the organo-RCMs turn to more hydrophilic. The results of this work also indicated that it is possible to regulate the wettability of the RCMs by choosing different recipe of QASs, which is helpful to provide theoretical guidance for the oil production.

Steric effects of polymethylene chain length on the liquid-liquid extraction of copper(II) with bis(4-acylpyrazol-5-one) derivatives

1989 ◽  
Vol 28 (15) ◽  
pp. 3014-3017 ◽  
Author(s):  
Shoji Miyazaki ◽  
Hiroshi Mukai ◽  
Shigeo Umetani ◽  
Sorin Kihara ◽  
Masakazu Matsui
Keyword(s):  
Chain Length ◽  
Liquid Extraction ◽  
Steric Effects ◽  
Polymethylene Chain ◽  
Liquid Liquid Extraction

The synergistic effect of hierarchical structure and alkyl chain length on the antifouling and bactericidal properties of cationic/zwitterionic block polymer brushes

2020 ◽  
Vol 8 (24) ◽  
pp. 6890-6902 ◽  
Author(s):  
Yuanyuan He ◽  
Xinyuan Wan ◽  
Weiwei Lin ◽  
Jiehua Li ◽  
Zhen Li ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Chain Length ◽  
Hierarchical Structure ◽  
Polymer Brushes ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Block Polymer ◽  
Bactericidal Properties

A well-organized hierarchical structure and appropriate alkyl chain length facilitate the synergistic anti-biofilm effect.

Novel polyfluoroalkylated pyrazoles from 2-polyfluoroacylcycloalkanones and hydrazines: syntheses and unequivocal molecular structure assignment

2001 ◽  
Vol 79 (2) ◽  
pp. 183-194 ◽  
Author(s):  
D V Sevenard ◽  
O G Khomutov ◽  
M I Kodess ◽  
K I Pashkevich ◽  
I Loop ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Chain Length ◽  
Tautomeric Form ◽  
Ring Size ◽  
Polymethylene Chain ◽  
Structure Assignment ◽  
Substituted Hydrazines

The reaction between 2-trifluoroacetylcycloalkanones and methylhydrazine or phenylhydrazine exclusively yields 3-CF3-pyrazoles. When the chain length of the polyfluorinated substituent in RFC(O) group increases, 5-RF-pyrazoles are isolated. The reaction of 2-trifluoroacetylcyclohexanone with 2-hydrazinopyradine gives 5-hydroxypyrazoline, an intermediate in the formation of 5-CF3-pyrazoles. The regiochemistry of the condensation is probably controlled by the nucleophilicity of the terminal nitrogen in the mono substituted hydrazines and by the steric requirements of the RF group in the 1,3-diketones. Polymethylene chain containing pyrazoles obtained from the 1,3-diketones in question and hydrazine prefer the 3-RF tautomeric form, irrespective of carbocyclic ring size and polyfluoroalkyl group chain length.Key words: polyfluorinated 1,3-diketones, hydrazines, isomeric pyrazoles, molecular structure.

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