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Heterocyeles

A feature eommon to the pyrazine, quinoxaline and phenazine ring systems is their remarkable stability in the mass speetrometer and in all eases with the parent heterocyeles the moleeular ion is the base peak. In the ease of pyrazine, two major fragments are observed at mje 53 and 26, and these fragments are eonsistent with the fragmentation pattern shown in Seheme 1. [Pg.162]

Table 7 Reactivities of Some Azoles and Other Five-membered Heterocyeles in Acid-catalyzed Deuteriodeprotonation <74jcs(P2)399>... Table 7 Reactivities of Some Azoles and Other Five-membered Heterocyeles in Acid-catalyzed Deuteriodeprotonation <74jcs(P2)399>...
Lapachenole — see 2H-Naphtho[l,2-6]pyran a-Lapachone, dehydrosynthesis, 3, 751 Large heterocyelic rings anions, 7, 18 aromatieity, 7, 14, 16 basicities, 7, 24 bond angles, 7, 14-16 bond lengths, 7, 14-16 cations, 7, 18... [Pg.695]

CHE837 R. M. Acheson, Chem. Heterocyel. Compd. (Enpl. TransL) 12, 837... [Pg.147]

JHC1183 B. Laude. M. Soufiaoui. and J. Arriau. J. Heterocyel. Chem. 14, 1183... [Pg.147]

Volume 13 of this serial publication comprises six chapters of which four deal with general accounts of compound classes 1-azirines (F. W. Fowler), phenanthridines (B. R. T. Keene and P. Tissington), tri-thiapentalenes (N. Lozac h), and heterocyclic ferrocenes (F. D. Popp and E. B. Moynahan). The other two chapters are concerned with particular aspects of the chemistry of groups of heterocyeles the tautomerism of purines (B. Pullman and A. Pullman) and quantitative aspects of the electrophilic substitution reactions of five-membered rings (G. Marino). [Pg.450]

JHC129 I. E.-S. El-Kholy, M. M. Mishrikey and H. M. Fuid-Alla J. Heterocyel Chem.,... [Pg.1146]

See other pages where Heterocyeles is mentioned: [Pg.284]    [Pg.594]    [Pg.695]    [Pg.920]    [Pg.523]    [Pg.315]    [Pg.261]    [Pg.291]    [Pg.291]    [Pg.295]    [Pg.517]    [Pg.521]    [Pg.523]    [Pg.537]    [Pg.246]    [Pg.212]    [Pg.221]    [Pg.556]    [Pg.176]    [Pg.83]    [Pg.83]    [Pg.488]    [Pg.1343]    [Pg.1345]    [Pg.1505]    [Pg.1509]    [Pg.170]    [Pg.147]    [Pg.147]    [Pg.147]    [Pg.147]    [Pg.264]    [Pg.460]    [Pg.60]    [Pg.11]    [Pg.92]    [Pg.92]    [Pg.92]    [Pg.92]    [Pg.76]    [Pg.76]    [Pg.388]   


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Five-Membered Heterocyeles

Synthesis of heterocyeles

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