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L. V. Klyba N. A. Nedolya O. A. Tarasova E. R. Zhanchipova O. G. Volostnykh 《Russian Journal of Organic Chemistry》2009,45(4):596-608
The electron impact mass spectra of previously unknown 2-alkyl-6-alkoxy-, 2,3-trimethylene-6-alkoxy- and 2-alkyl-6-aryl(hetaryl)-3H-azepines were studied. All compounds give rise to stable molecular ions (I
rel = 44–100%) whose fragmentation pattern is determined mainly by the substituent on C6. Decomposition of the molecular ions derived from 6-alkoxy derivatives (R1 = MeO, EtO, i-PrO) follows general relations typical of alkyl ethers. The main characteristic peaks in the mass spectra of 2-methyl-6-aryl-
and 2-methyl-6-hetaryl-3H-azepines (R1 = Ph, 1H-pyrrol-1-yl, 5-methylthiophen-2-yl) belong to even-electron rearrangement ions [M − H]+ and [M − Me]+, which have conjugated bi- and tricyclic structures, and products of their subsequent decomposition. Substituents in positions
2 (R2) and 3 (R4) [R4 = H, R2 = Me, Et; R2R4 = (CH2)3] bring some specificity to the fragmentation pattern, but their contribution is not crucial.
Original Russian Text ? L.V. Klyba, N.A. Nedolya, O.A. Tarasova, E.R. Zhanchipova, O.G. Volostnykh, 2009, published in Zhurnal
Organicheskoi Khimii, 2009, Vol. 45, No. 4, pp. 610–621.
For communication VII, see [1]. 相似文献