Mechanism of formation of doubly charged fragments from bis-benzyltetrahydroisoquinolines under electron impact
摘要:
AbstractSome bis‐benzyltetrahydroisoquinolines [α,α′‐di‐N,N‐(1‐benzyl‐1,2,3,4‐tetrahydroisoquinoline)‐p‐xylene and various substituted analogues] give rise to very abundant doubly charged fragment ions under electron impact, corresponding to the loss of the two benzyl groups. Substituent effects, ionization and appearance energy measurements and metastable transitions show that these doubly charged ions are formed (at least in part) from singly charged precursors by a heterolytic cleavage (charge separation).
Synthesis and Photo-oxygenation of Some Substituted 1-Benzyl-3,4-dihydroisoquinolines. Mechanism of Enamine Photo-oxygenation
作者:Ned H. Martin、Charles W. Jefford
DOI:10.1002/hlca.19820650314
日期:1982.5.5
Bischler-Napieralski cyclization is described. Competitive methylene blue sensitized photo-oxygenation experiments allowed the determination of relative rates of photo-oxygenation of 1-benzyl-3,4-dihydroisoquinolines, Substituents were shown to affect both the equilibrium concentration of the tautomeric enamine and the overall photo-oxygenation rate. After correcting for differences in enamine concentration, the relative
Regiospecific oxidation of substituted 1-benzyl-3,4-dihydro-isoquinolines using singlet oxygen
作者:Ned H. Martin、Sidney L. Champion、Phillip B. Belt
DOI:10.1016/s0040-4039(00)92819-3
日期:1980.1
Singletoxygen regiospecifically oxidizes 1-benzyl-3,4-dihydroisoquinoline. Mechanistic studies do not distinguish between a dioxetane or the alternative zwitterionic peroxide intermediate.
Amaravathi, M.; Kumari, L. Krishna; Pardhasaradhi, M., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1983, vol. 22, # 12, p. 1246 - 1247
作者:Amaravathi, M.、Kumari, L. Krishna、Pardhasaradhi, M.
DOI:——
日期:——
MARTIN, N. H.;JEFFORD, C. W., HELV. CHIM. ACTA, 1982, 65, N 3, 762-774