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Kh. Sh. Khariton M. A. Rekhter G. I. Zhungietu N. I. Chmykhova B. T. Oloi 《Chemistry of Heterocyclic Compounds》1979,15(1):66-70
The molecular ions of isatin (I) and N-methyl- (II) and N-ethylisatin (III) -thiosemicarbazones undergo fragmentation via many pathways with the elimination of NH3, H2S, CO, CH2N2, CHN3, CH2N2S, CH2NS, and CHNS particles; this is due to primary localization of the charge on the heteroatoms of the thiosemicarbazone residue. A previously unknown rearrangement, which consists in migration of an HS group to the -carhon atom of the heteroring with subsequent ejection of a CHN3 fragment. The [M — CO]+ ions undergo fragmentation with the elimination of CH2N2S; in the case of II and III fragmentation is preceded by detachment of a hydrogen atom (II) or a methyl group (III) from the substituent attached to the ring nitrogen atom. The [M — CO, -H, -CH2NS]+ (II) and [M — CO, -CH3, -CH2N2S]+ (III) ions undergo fragmentation with the ejection of HCN in two ways through both the ring nitrogen atom and the thiosemicarbazone residue. Schemes for the principal pathways of fragmentation and rearrangements are presented. The compositions of the ions were confirmed by the high-resolution mass spectra and the mass spectra of the N-deuteroalkyl derivatives.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 75–79, January, 1979. 相似文献
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Summary The stereochemistries of three oxides of the bicyclohomofarnesane series have been established by spectral and chemical methods.Institute of Chemistry, Academy of Sciences of the Moldavian SSR, Kishinev. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 449–454, July–August, 1978. 相似文献
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Zhungietu G. I. Chmykhova N. I. Rekhter M. A. Khariton Kh. Sh. Oloi B. T. Dormidontova N. P. 《Chemistry of Heterocyclic Compounds》1977,13(5):515-518
The mass spectra of N-propyl- (I), N-allyl- (IV), and N-propargylisatin (VII) and their 5-methyl (II, V, VIII) and 7-methyl (III, VI, and IX) derivatives were recorded. It is shown that a portion of the [M-2CO]+ ions in the mass spectra of N-propargylisatins undergo rearrangement to give ions with a quinoline structure. A scheme for the fragmentation of the investigated compounds is presented. The mass spectra of the 5- and 7-methyl derivatives are compared.See [1] for communication I.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 639–641, May, 1977. 相似文献
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G. I. Zhungietu N. I. Chmykhova V. I. Gorgos M. A. Rekhter Kh. Sh. Khariton 《Chemistry of Heterocyclic Compounds》1977,13(5):518-521
In contrast to isatin and N-methylisatin, their ethylene-, propylene-, and 2,3-butyleneketals undergo fragmentation via several pathways. In addition to the principal fragmentation pathway — successive loss by the molecular ion (M+) of a CO group and a dioxolane ring or its fragment, the M+ ions of the ketals are also fragmented with elimination of a dioxolane fragment or the substituent attached to the nitrogen atom and, subsequently, a fragment of the dioxolane ring. The fragmentations of some of the fragment ions were investigated by means of the mass spectra of N-trideuteromethyl analogs.See [2] for communication II.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 642–645, May, 1977. 相似文献
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E. P. Styngach F. Sh. Rivilis N. M. Frolova Kh. Sh. Khariton A. A. Semenov 《Chemistry of Heterocyclic Compounds》1974,10(8):927-929
The reaction of substituted aziridines with indole was studied. It is shown that the presence of electron-donor substituents attached to the carbon atom or of bulky substituents attached to the nitrogen atom in aziridines favors cleavage of the aziridine ring by indole to give derivatives of tryptamine and tryptophan.For Communication VI see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1066–1069, August, 1974. 相似文献
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Kh. Sh. Khariton G. I. Zhungietu M. A. Rekhter B. T. Oloi N. I. Chmykhova 《Chemistry of Heterocyclic Compounds》1975,11(7):840-843
It is shown that in the mass spectra of N-alkylisatins with a normal C1-C10 chain the intensity of the [M-CO]+- and [M-(2CO)]+. peaks characteristic for isatin and N-methylisatin decreases as the alkyl radical is lengthened, whereas the intensity of the peak formed as a result of successive loss by the molecular ion of a CO group and a portion of the radical as a result of cleavage of the bond at the α-carbon atom increases. Fragments due to α,β,γ... cleavages, both without migration and with migration of the hydrogen atoms, appear in the spectra of N-alkylisatins commencing with chains containing more than two C atoms. 相似文献
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