B. I. Drevko
Saratov State University
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Featured researches published by B. I. Drevko.
Chemistry of Heterocyclic Compounds | 1996
B. I. Drevko; M. I. Smushkin; V. G. Kharchenko
We have studied the oxidation of 4H-chalcogenopyrans and chalcogenopyrylium salts by lead tetraacetate. We have established that the major reaction products on oxidation of 2,6-diphenyl-4H-thiopyran and selenopyran are 2,6-diphenyl-4H-thio(seleno)pyran-4-ones, while 2-benzoyl-5-phenyl(seleno)thiophenes are formed as impurities. The major product on oxidation of 2,6-diphenyl-4H-pyran is 2-benzoyl-5-phenylfuran. We have shown that 2,4,6-triphenyl-4H-pyran does not undergo oxidation by hydrogen peroxide in neutral medium, in contrast to its S and Se analogs. This supports the hypothesis that the heteroatom participates in the oxidation process.
Chemistry of Heterocyclic Compounds | 1999
B. I. Drevko; L. A. Fomenko; M. A. Suchkov; V. G. Kharchenko
Oxidation of solutions of 4H-thiopyrans and 4H-selenopyrans to the corresponding heteroaromatic cation bromide occurs on irradiation with ultraviolet light in the presence of CBr4. Reaction takes place by a free radical chain mechanism. The presence of CHBr3 and C2Br6 in the reaction mixture was detected chromatographically.
Chemistry of Heterocyclic Compounds | 1999
T. I. Gubina; B. I. Drevko; L. N. Fedina; S. M. Rogacheva; V. G. Kharchenko
The use of hydrogen sulfide at the moment of formation is proposed for the recyclization of furans into thiophenes in acidic media. The advantages of this method are shown.
Chemistry of Heterocyclic Compounds | 1995
B. I. Drevko; M. I. Smushkin; L. A. Fomenko; V. G. Kharchenko
The oxidation of 4H-4R-2,6-diphenylselenopyrans was studied. This reaction was found to depend on the presence of substituents at C(4) of the heterocycle and the reaction conditions.
Chemistry of Heterocyclic Compounds | 1989
B. I. Drevko; L. A. Fomenko; V. G. Kharchenko
The oxidation of 2,4,6-triaryl4-H-thio(seleno)pyrans with selenium oxide in pyridine was studied. It is shown that the corresponding 2,4-diaryl-5-aroyl-thiophenes and -selenophenes are formed as a result of the oxidation.
Chemistry of Heterocyclic Compounds | 1984
V. G. Kharchenko; B. I. Drevko
Two competing pathways were found in the transformations of 1,5-diketones and the 4H-selenopyrans formed from these diketones upon reaction with CF3CO2H in the presence of hydrogen selenide entailing disproportionation and the electrophilic addition of hydrogen selenide.
Chemistry of Heterocyclic Compounds | 1994
B. I. Drevko; L. A. Fomenko; M. I. Smushkin; O. I. Zhukov; E. V. Drevko; V. G. Kharchenko
Chemistry of Heterocyclic Compounds | 1998
B. I. Drevko; M. A. Suchkov; V. G. Kharchenko
Chemistry of Heterocyclic Compounds | 1991
S. N. Petrakov; B. I. Drevko; L. A. Fomenko; V. G. Kharchenko
Chemistry of Heterocyclic Compounds | 1984
V. G. Kharchenko; B. I. Drevko
