Kinetics and mechanisms of nucleophilic displacements with heterocycles as leaving groups. Part 10. Reactions of s-alkyl primary amines with pyryliums
作者:Alan R. Katritzky、Jorge Marquet、Jeremy M. Lloyd、James G. Keay
DOI:10.1039/p29830001435
日期:——
α-phenylbenzylamine forms the corresponding carbonium ions which may be trapped by nucleophiles. Isolated 1-cycloalkylbenzoquinoliniums (2) solvolyse but the SN1 mechanism (for five-, six-, and seven-membered rings): for the cyclobutyl case an SN2 reaction is also found.
2,4,6-三苯基吡啶与仲烷基胺可制得可分离的吡啶鎓(吡啶鎓被亲核试剂取代为S N 2并消除为烯烃)。与1-苯基乙胺和α-苯基苄基胺形成的2,4,6-三苯基吡啶鎓形成相应的碳离子,这些碳离子可能被亲核试剂捕获。分离的1-环烷基苯并喹啉鎓盐(2)溶剂分解但具有S N 1机理(对于五元,六元和七元环):对于环丁基,还会发现S N 2反应。
KATRITZKY, A. R.;MARQUET, J.;LLOYD, J. M.;KEAY, J. G., J. CHEM. SOC. PERKIN TRANS., 1983, N 9, 1435-1441
作者:KATRITZKY, A. R.、MARQUET, J.、LLOYD, J. M.、KEAY, J. G.
DOI:——
日期:——
Katritzky, Alan R.; Lloyd, Jeremy M.; Patel, Ranjan C., Journal of the Chemical Society. Perkin transactions I, 1982, p. 117 - 124
作者:Katritzky, Alan R.、Lloyd, Jeremy M.、Patel, Ranjan C.
DOI:——
日期:——
Kinetics and mechanisms of nucleophilic displacements with heterocycles as leaving groups. Part 9. N-substituted 2,4,6-triphenylpyridiniums, 5,6-dihydro-2,4-diphenylbenzo[h]quinoliniums, and 5,6,8,9-tetrahydro-7-phenyldibenzo[c,h]acridiniums: kinetic rate variation with structure of the N-substituent
作者:Alan R. Katritzky、Kumars Sakizadeh、Yu Xiang Ou、Bratislav Jovanovic、Giuseppe Musumarra、Francesco P. Ballistreri、Roberto Crupi
DOI:10.1039/p29830001427
日期:——
order benzyl > methyl ≃ s-alkyl > continuous chain primary alkyl ≃ neopentyl. Comparisons with literature data involving other leavinggroups, standardized by reference to the ethyl compound in each series, again show that groups larger than ethyl tend to react faster in series (1), (2), and especially (3) than expected, and methyl tends to react more slowly. Similar but smaller trends are found in literature