Solvolysis of Tricyclo[4.1.0.02,7]hept-4-en-3-yl and Tricyclo[4.1.0.02,7]hept-3-yl Methanesulfonates andp-Nitrobenzoates – Remarkably Small Enthalpy Difference between the C7H7 Cations Tricyclo[4.1.0.02,7]hept-4-en-3-yl and 7-Norbornadienyl
作者:T. William Bentley、Gareth Llewellyn、Simon J. Norman、Ralf Kemmer、Ulrike Kunz、Manfred Christl
DOI:10.1002/jlac.199719970134
日期:1997.1
respectively. – The solvolysis of 6b, c in aqueous ethanol and of 6b in 2,2,2-trifluoroethanol (TFE) gave nonrearranged products exclusively, i.e. the alcohols 4b, c, the ethyl ethers 17b, c, and the trifluoroethyl ether 18b. In contrast, from 12 only rearranged products arose, namely anti-7-norbornenol (30) and its ethyl ether 31. The solvolysis of the unsubstituted tricycloheptenyl p-nitrobenzoate 11a in 80%
在先前工作的扩展中,三苯并[4.1.0.0 2,7 ]庚三-3-醇(5)从苯并戊烯经四个步骤合成。甲磺酸盐12和图6b,C,从制备5和4- halotricyclo [4.1.0.0 2,7 ]庚-4-烯-3-醇4b中,C,太不稳定被分离,但是可以通过NMR谱明确地定性。用甲磺酰氯处理未取代的三环庚烯醇4a时,未观察到预期的甲磺酸酯6a。即使在−40°C下,也只有其连续的产物3-氯三环[4.1.0.0 2,7 ]庚-4-烯(7a)和7-氯降冰片二烯(8a)是可辨别的。6b的类似反应仅在室温下发生,形成二氯三环庚烯7b和二氯降冰片二烯8b。6b和12的重排产物分别是甲磺酸氯降冰片二烯10b和抗-7-降冰片烯基甲磺酸酯(13)。– 6b,c在乙醇水溶液中的溶剂分解和6b在2,2,2-三氟乙醇(TFE)中的溶剂分解仅产生未重排的产物,即醇4b,c,乙醚17b,c,和三氟乙基醚18b。相反,只有1