Substituent Effects on the Solvolysis Rates and Gas Phase Stabilities of 1,2,2-Trimethyl-1-phenylpropyl and 1,2,2-Trimethyl-1-(2-methylphenyl)propyl Systems
作者:Kazuhide Nakata、Mizue Fujio、Masaaki Mishima、Hideyuki Nomura、Yuho Tsuno、Kichisuke Nishimoto
DOI:10.1246/bcsj.72.581
日期:1999.3
Substituent effects on the solvolysis rates of 1,2,2-trimethyl-1-phenylpropyl chlorides in 80% (v/v) aq acetone at 45 °C and 1,2,2-trimethyl-1-(2-methylphenyl)propyl p-nitrobenzoates in 50% (v/v) aq ethanol at 75 °C were correlated with the Yukawa–Tsuno equation to give ρ = −4.28 and r = 0.91, and ρ = −2.78 and r = 0.70, respectively. The reduction in r values from r = 1.00 for full conjugation is
取代基对 1,2,2-三甲基-1-苯丙基氯化物在 80% (v/v) 丙酮水溶液中 45 °C 和 1,2,2-三甲基-1-(2-甲基苯基)丙基的溶剂分解速率的影响75 °C 下 50% (v/v) 乙醇水溶液中的对硝基苯甲酸酯与 Yukawa-Tsuno 方程相关,分别给出 ρ = -4.28 和 r = 0.91,以及 ρ = -2.78 和 r = 0.70。完全共轭的 r 值从 r = 1.00 减少归因于碳阳离子中心和过渡态苄基 π 系统的共面性偏差。取代基对 1,2,2-三甲基-1-苯基丙基阳离子和 1,2,2-三甲基-1-(2-甲基苯基)丙基阳离子的气相稳定性的影响相关联,得到 ρ = -9.1 和 r = 0.89和 ρ = -6.6 和 r = 0.70,分别。对于过渡态和中间体获得了相同的 r 值。