Distinguishing 1,2-cyclopentanediol isomers via gas-phase reactions with trimethyl-group 14 cations
作者:William J. Meyerhoffer、Maurice M. Bursey
DOI:10.1016/0022-328x(89)85040-5
日期:1989.9
Reactions with trimethyl-group 14 (CH3)3X+ ions (X = C, Si, Gen, Sn) are used to distinguish between cis- and trans-1,2-cyclopentanediol isomers in a triple quadrupole mass spectrometer. At a kinetic energy of 1.2 eV (center of mass), there are substantial differences in the decomposition behavior of the [M + (CH3)3X]+ adducts, particularly for trimethylsilyl and trimethylgermyl ions. The cis-1,2-cyclopentanediol
与三甲基14(CH 3)3 X +离子(X = C,Si,Gen,Sn)的反应用于区分三重四极杆质谱仪中的顺式和反式-1,2-环戊二醇异构体。在1.2 eV(质心)的动能下,[ M +(CH 3)3 X] +加合物的分解行为存在很大差异,尤其是对于三甲基甲硅烷基和三甲基锗烷基离子而言。所述顺式-1,2-环戊二醇异构体有利于分解[中号+(CH 3)3 X] +生成水合三甲基14离子[(CH 3)3 XOH 2 ] +。对于反式二醇,[(CH 3)3 XOH 2 ] +的形成显然是吸热过程,需要额外的能量输入。在所采用的离子动能下,反式-1,2-环戊二醇表现出更高的加合物离子稳定性。发现三甲基锗烷基反应物比其他14族阳离子更灵敏且在立体化学上具有选择性。相反,叔丁基离子提供了最无效的立体化学探针。