α-pinene at 256.7°C for 2400 s gave dipentene with twice as much deuterium as hydrogen transfer with kH/kD=1.49 and alloocimine with a Z and E trideuteriomethyl ratio of ca. 5 with kH/kD=0.89. The isotope effect on loss of starting material was 1.16. Separation of the enantiomers of α-pinene from 3600 s pyrolyses at 256.7°C followed by NMR analysis revealed that the ratio of the R-syn to R-anti to S-anti
旋光性α-pine烯的热解得到95%的外消旋
柠檬烯(二
戊烯),别
甲胺,外消旋的α-pine烯,α-py烯。报告激活参数。(S)syn -6-trideuteriomethylα-pinene在256.7°C的温度下热解2400 s,生成的二
戊烯的
氘量是氢转移的两倍,k H / k D = 1.49,Z和E的三异
氘甲基比值约26。5 ķ ħ / ķ d = 0.89。同位素对原料损失的影响为1.16。在256.7°C下从3600 s热解中分离出α-pine烯的对映体,然后进行NMR分析,结果表明[R -顺式到- [R -抗到小号-反异构体是4.6:3.7:1,在大约两个半衰期。动力学分析表明,先前提出的涉及两个具有C s对称性的双自由基缓慢相互转化的转化机理与α-pine烯异构体的分布不一致,特别是与键相比更多的表面保留产物(R - anti)的形成-旋转异构体(S - anti)。另一个的