The 1 : 1 adduct ion formation between a series of per-O-acetylated aldopyranoses (family 1) or N-butylated glycosylamines (family 2) and an organic/metallic cation (n-C8H17NH3+/K+ or Li+) has been examined using quantitative FAB mass Spectrometry. The per-O-acetyl modifications dramatically lead to negated selectivity of the carbohydrates toward the cation which has been clearly observed in per-O-methyl modifications. On the other hand, the mono-N-butyl modifications provide a similar selectivity pattern to mono-O-methyl ones. These results are understood on the basis of electronic and structural considerations.
使用 FAB 质谱法定量检测了一系列过-O-乙酰化醛
吡喃糖(1 族)或 N-丁酰化糖基胺(2 族)与有机/
金属阳离子(n-C8H17NH3+/K+ 或 Li+)之间形成的 1 : 1 加合物离子。过-O-乙酰基修饰显著降低了
碳水化合物对阳离子的选择性,这一点在过-O-甲基修饰中也得到了清晰的观察。另一方面,单-N-丁基修饰提供了与单-O-甲基修饰相似的选择性模式。根据电子和结构方面的考虑,我们可以理解这些结果。