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71.
Yu. I. Sal’nikov G. A. Boos I. S. Ryzhkina A. P. Burilov T. N. Pashirova A. S. Gazizov 《Russian Journal of General Chemistry》2006,76(2):206-210
The protolytic and complexing properties of phosphorylated derivatives of calix[4]resorcinolarenes were studied by pH-metric titration at 298 K in water-2-propanol (80 vol % 2-propanol). It was shown that calix[4]resorcinolarene containing the propylphosphonic acid fragment at the C atom linking the aryl groups exists in solution mainly as tetramer. At pH > 4, the anions of tetrameric, dimeric, and monomeric forms of this compound are formed. The neutral form of aminomethylated calix[4]resorcinolarene contaning, along with the propylphosphonic acid fragment, the CH2NEt2 group on the opposite side of the molecule is monomeric. It exists as a zwitterion and contains four betaine protons. Three dimeric species of this compound, one protonated and two deprotonated, were revealed. The dissociation constants of the phosphonate groups and two betaine protons were evaluated. The other two betaine protons and the protons of hydroxy groups do not dissociate. The equilibrium constants of the complex formation with lanthanum(III) and in some cases the stability constants of the complexes were calculated. Probable modes of coordination of calix[4]resorcinolarenes are discussed. Depending on the acidity of the medium, the competition between the phosphonic group and the phenolate ions takes place, and complexes with the coordination via phosphonic groups can rearrange into complexes with the coordination via phenolate groups. 相似文献
72.
A. V. Smolobochkin A. S. Gazizov L. I. Vagapova A. R. Burilov M. A. Pudovik 《Russian Chemical Bulletin》2014,63(1):284-285
Reaction of 1-(4,4-diethoxybutyl)urea with resorcinol, 2-methylresorcinol and pyrogallol in chloroform in the presence of trifluoroacetic acid affords new 2,2′-(1,3-phenylene)-bis(pyrrolidine-1-carboxamides). 相似文献
73.
Trifonov A. V. Kibardina L. K. Pudovik M. A. Gazizov A. S. Burilov A. R. 《Russian Journal of General Chemistry》2022,92(7):1241-1245
Russian Journal of General Chemistry - The method was developed for the synthesis of previously unknown pyridoxal (vitamin B6) derivatives, containing a carbonyl group and a dihydrofuropyridine... 相似文献
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T. N. Pashirova S. S. Lukashenko E. M. Kosacheva M. V. Leonova L. I. Vagapova A. R. Burilov M. A. Pudovik L. A. Kudryavtseva A. I. Konovalov 《Russian Journal of General Chemistry》2008,78(3):402-409
Self-assembling in systems poly(ethylene) imine-aminomethylated calix[4]resorcinarene-water-DMF (30 vol%) and catalytic properties of these compositions in hydrolysis of 4-nitrophenylbis (chloromethyl)phosphinate are studied. Critical concentrations of association, aggregates radii, and kinetic parameters of the reaction are established. 相似文献
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I. R. Knyazeva V. I. Sokolova A. R. Burilov M. A. Pudovik A. B. Dobrynin O. N. Kataeva O. G. Sinyashin 《Russian Chemical Bulletin》2012,61(3):631-637
A number of new acetals bearing phosphonium moieties with P-N bonds were prepared. Their condensation with resorcinols in acidic water-alcohol solutions was studied, which led to new phosphonium salts having a diarylmethane fragment. 相似文献