dielectric constants was also studied. A transition state 9'a and an ion pair intermediate 3a are suggested for the rearrangement. The stereochemical course of the reactions of (S)-1a, (R)-2a and (S)-2a with hydroxide and methoxide ions have been shown to be 100% stereospecific with an uncertainty of about 1%. The absolute configurations of all optically active reactants and products [(S)- and (R)-4a,
通过在苯的三个温度下,研究了(S)2
氯甲基-1-乙基
吡咯烷[(S)-1a ]到(R)-
3-氯-1-乙基哌啶[(R)2a ]的热重排速率。PMR和极化仪。重排被证明是完全立体定向的,并且遵循简单的一阶速率定律。对E计算一个为ΔH‡和ΔS‡22±2 (25°),21±2.5 (25°)和- (0°K)分别为10±2 Eu等。还研究了具有不同介电常数的溶剂的作用。过渡态9'a和离子对中间体3a建议重新安排。(S)-1a,(R)-2a和(S)-2a与氢氧化物和
甲醇盐离子的反应的立体
化学过程已显示为100%立体有择的,不确定性约为1%。所有旋光性反应物和产物[(S)-和(R)-4a,(S)-4b(R)-和(S)-5a,(R)-5b,(S,S ')的绝对构型-图6a,(小号,ř通过与已知化合物的
化学相关性或通过ORD和
化学推论来建立')-7a和(R,R ')- 8a ]。亲核试剂对1-氮杂-1-乙基双环[3