新的β-二氢沉香呋喃倍半萜多酯的HRFABMS和EIMS研究

HRFABMS AND EIMS OF NEW β-DIHYDROAGAROFURAN SESQUITERPENE POLYOL ESTERS

利用高分辨快原子轰击质谱 (HRFABMS)分析了八个新的β-二氢沉香呋喃倍半萜多酯的FABMS。结果表明 ,所有该类化合物均可以精确地获得 [M+Na]+ 准分子离子的分子组成 ,从而方便地获得原有化合物分子量和分子式 ,所测化合物的 FABMS谱中均存在 [M+H - H2 O]+ 特征离子 ,为化合物分子式的确定提供了进一步的佐证 ;在该类化合物的 EIMS谱中 ,观测不到分子离子的存在 ,但一般可以获得 [M- CH3]+ ,[M- Ac]+ ,[M- HOAc]+ 等特征离子以及高强度的酰基离子。将 EIMS和 FABMS结合起来可以快速准确地获得化合物的分子量、分子式以及相关的取代酰基等结构信息。

The EIMS and HRFABMS spectra of eight new β dihydroagarofuran sesquiterpene polyol esters were analyzed.The results showed that the characteristic ions[M+Na] + and [M+H H 2O] + peaks could be obtained and determined accurately.With these characteristic ions in the HRFABMS spectra,the molecular weight and formula of this kind of compounds could be obtained easily.Generally,the molecular ion M + could not be observed,but the characteristic ions [M CH 3] +,[M Ac] +,[M HOAc] + and Acyl existed in their EIMS spectra.Along with these ions,the characteristic ion at m/z 202 or 192 indicated that the benzyloxy or β furanfuryloxy is at C 9 in this kind of compounds.