作者:Suresh K. Dua、Robert B. Whait、Margaret J. Alexander、Roger N. Hayes、Albert T. Lebedev、Peter C. H. Eichinger、John H. Bowie
DOI:10.1021/ja00066a041
日期:1993.6
Deprotonated 1,2-diols and β-methoxyhydrins often eliminate ROH (R=H, Me) on collisional activation in the gas phase. These losses do not involve a negative ion pinacol rearrangement in acyclic systems in which there are no conformational restraints on the relative positions of the reacting groups. In the case of β-methoxyhydrins, labeling studies show that the product ion is formed by the losses of
去质子化的 1,2-二醇和 β-甲氧基醇通常在气相碰撞活化时消除 ROH(R=H,Me)。这些损失不涉及无环系统中的负离子频哪醇重排,其中反应基团的相对位置没有构象限制。在 β-甲氧基醇的情况下,标记研究表明产物离子是由相邻位置的甲醇离子和质子丢失形成的。该过程没有氘同位素效应,排除了消除过程的操作:我们建议甲醇的损失是通过环氧化物环化进行的,即。Me 2 C(OMe)C(O - )(Me) 2 →(MeO - )-CH 3 (Me)CC(Me) 2 →CH 2 =C(Me)C(O - )(Me) 2 +MeOH