- Ethynyl Carbocations. V. Synthesis and Properties of 4-Phenylethynyl-4H-pyrans
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A method for preparation of 4-phenylethynyl-4H-pyrans was developed, and their reactions with acid reagents, resulting in 4-phenylethynylpyrylium salts and 1,5-diketones containing ethynyl and allene moieties, were studied.Conditions for nucleophilic addi
- Koblik, A. V.,Murad'yan, L. A.
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p. 245 - 253
(2007/10/03)
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- REACTIONS OF HETEROCYCLIC CATIONS WITH N-CONTAINING NUCLEOPHILES. 14. RECYCLIZATION OF 2,6-DIPHENYLPYRYLIUM PERCHLORATE UNDER THE INFLUENCE OF NUCLEOPHILES WITH AN N-C-N FRAGMENT
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The recyclization of 2,6-diphenylpyrylium perchlorate under the influence of isothioureas, guanidine, 2-aminobenzimidazoles, 2-aminonaphthimidazole, 2-aminothiazole, 2-aminobenzothiazole, and 2-aminopyridine was studied.The examined reactions lead to monocyclic or condensed pyrimidines.
- Zvezdina, E. A.,Zhdanova, M. P.,Giryavenko, I. I.
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p. 714 - 719
(2007/10/02)
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- Reactions of heterocyclic cations with nitrogen-containing nucleophiles. 11. Reaction of 2,6-diphenylpyrylium perchlorate with primary amines, hydrazine, and hydroxylamine
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The reaction of 2,6-diphenylpyrylium perchlorate with methylamine and various anilines in acetic acid leads to pyridinium salts; 3,4-bispyridinium perchlorates were obtained in dimethylformamide. The reaction of 2,6-diphenylpyrylium perchlorate with hydrazine and the sodium salt of hydroxylamine leads to 3-phenyl-5-phenacyl-2-pyrazoline and -2-isoxazoline.
- Zvezdina,Popova,Pyshchev,Dorofeenko
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p. 344 - 347
(2007/10/02)
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