The results of investigations into the formation of the various ionic forms of heteroarenium salts, their characteristics, and their reactivity are summarized. Salts containing (4n+2)π-electron aromatic cations (n = 0–3), including chalcogenopyrylium (O, S, Se), azinium, benzo- and dibenzoazinium, and chalcogenoazolium (O, S, Se, NR) ions are examined. In this system of compounds the relationships between the structure and the macroscopic characteristics of the heteroarenium salts (ionization constants, association/dissociation constants, distances of closest interionic approach) and the effect of the nature of the ionic forms in the solutions on their reactivity in heterolytic reactions are analyzed.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Chemischer InformationsdienstVolume 17, Issue 43 Article ChemInform Abstract: Influence of the Heteroatom on the Electrochemical Reactivity of Organic Cations of the 6π-Isoelectronic Series. V. SH. TSVENIASHVILI, V. SH. TSVENIASHVILISearch for more papers by this authorO. P. SHVAIKA, O. P. SHVAIKASearch for more papers by this authorM. V. MALASHKHIYA, M. V. MALASHKHIYASearch for more papers by this authorN. A. KOVACH, N. A. KOVACHSearch for more papers by this authorV. F. LIPNITSKII, V. F. LIPNITSKIISearch for more papers by this author V. SH. TSVENIASHVILI, V. SH. TSVENIASHVILISearch for more papers by this authorO. P. SHVAIKA, O. P. SHVAIKASearch for more papers by this authorM. V. MALASHKHIYA, M. V. MALASHKHIYASearch for more papers by this authorN. A. KOVACH, N. A. KOVACHSearch for more papers by this authorV. F. LIPNITSKII, V. F. LIPNITSKIISearch for more papers by this author First published: October 28, 1986 https://doi.org/10.1002/chin.198643067AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume17, Issue43October 28, 1986 RelatedInformation

Metal ions are shown to enhance heterolysis of RX as Lewis acids, and as charged particles they affect hydrolysis selectivity.

Chemischer InformationsdienstVolume 11, Issue 27 Reviews ChemInform Abstract: AROMATICITY AND ANTIAROMATICITY OF AZINES YU. B. VYSOTSKII, YU. B. VYSOTSKIISearch for more papers by this authorN. A. KOVACH, N. A. KOVACHSearch for more papers by this authorO. P. SHVAIKA, O. P. SHVAIKASearch for more papers by this author YU. B. VYSOTSKII, YU. B. VYSOTSKIISearch for more papers by this authorN. A. KOVACH, N. A. KOVACHSearch for more papers by this authorO. P. SHVAIKA, O. P. SHVAIKASearch for more papers by this author First published: July 8, 1980 https://doi.org/10.1002/chin.198027330AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume11, Issue27July 8, 1980 RelatedInformation

Chemischer InformationsdienstVolume 9, Issue 4 Heterocyclic Compounds ChemInform Abstract: STUDY OF OXAZOLIUM CATIONS BY THE SCF MO LCAO METHOD YU. B. VYSOTSKII, YU. B. VYSOTSKIISearch for more papers by this authorN. A. KOVACH, N. A. KOVACHSearch for more papers by this authorO. P. SHVAIKA, O. P. SHVAIKASearch for more papers by this author YU. B. VYSOTSKII, YU. B. VYSOTSKIISearch for more papers by this authorN. A. KOVACH, N. A. KOVACHSearch for more papers by this authorO. P. SHVAIKA, O. P. SHVAIKASearch for more papers by this author First published: January 24, 1978 https://doi.org/10.1002/chin.197804205AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume9, Issue4January 24, 1978 RelatedInformation

The electron densities, the lower singlet-singlet transitions, and the diamagnetic characteristics were calculated on the basis of the semiempirical self-consistent-field method for a number of oxazolium and variously substituted oxazolium cations. The results were found to be in agreement with the available experimental data. The parameters of the nitrogen atom in the oxazolium cations were adopted within the framework of a unified parametrization that unites the pyridine, pyrrole, and immonium nitrogen atoms. It was found that over a broad range of structural changes in the oxazolium cation the maximum positive charge is found in the 2 position; this determines the site of nucleophilic addition in reactions involving opening and recyclization of these heterocycles. It was shown that the phenyl substituent attached to the nitrogen atom is least conjugated with the heteroring as compared with the other positions in the oxazolium ring; as a consequence of this, the smallest bathochromic shift of the long-wave absorption band of the UV spectrum is observed in the series of phenyl-substituted oxazolium salts, and the N-methyl group markedly shifts the spectrum to the short-wave region. The scale of aromaticity of the investigated compounds, according to which the azolium cations are less aromatic than the corresponding bases, is given.

2,5-Dimethyl-1,3,4-oxa- and -1,3,4-thiadiazoles are recyclized to 2,5-dimethyl-4-amino-1,2,4-triazole on reaction with hydrazine. Recyclization occurs with greater difficulty and only with oxadiazole in the case of alkylhydrazines. Nitration of 2,5-dimethyl-4-amino-1,2,4-triazole gives its N-nitroamino derivative.

Chemischer InformationsdienstVolume 5, Issue 1 Heterocyclic Compounds ChemInform Abstract: RECYCLISIERUNGSREAKTIONEN IN DER REIHE DER 5-ARYLIDEN-1,3-THIAZOLIDONE BEI DER EINWIRKUNG VON HYDRAZINEN V. N. ARTEMOV, V. N. ARTEMOVSearch for more papers by this authorS. N. BARANOV, S. N. BARANOVSearch for more papers by this authorN. A. KOVACH, N. A. KOVACHSearch for more papers by this authorO. P. SHVAIKA, O. P. SHVAIKASearch for more papers by this author V. N. ARTEMOV, V. N. ARTEMOVSearch for more papers by this authorS. N. BARANOV, S. N. BARANOVSearch for more papers by this authorN. A. KOVACH, N. A. KOVACHSearch for more papers by this authorO. P. SHVAIKA, O. P. SHVAIKASearch for more papers by this author First published: January 8, 1974 https://doi.org/10.1002/chin.197401223Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume5, Issue1January 8, 1974 RelatedInformation