Gas-phase fragmentation reactions of protonated benzofuran- and dihydrobenzofuran-type neolignans investigated by accurate-mass electrospray ionization tandem mass spectrometry
作者:Herbert J. Dias、Manon Baguenard、Eduardo J. Crevelin、Vinicius Palaretti、Paul J. Gates、Ricardo Vessecchi、Antônio E.M. Crotti
DOI:10.1002/jms.4304
日期:2019.1
product ion C produces diagnostic ions K ([C-C2 H2 O]+ ), L ([K-CO]+ ), and P ([L-CO]+ ). Formation of product ions H ([D-H2 O]+ ) and M ([H-CO]+ ) is associated with the hydroxyl group at C-3 and C-3', whereas product ions N ([D-MeOH]+ ) and O ([N-MeOH]+ ) indicate a methoxyl group at the same positions. Finally, product ions F ([A-C2 H2 O]+ ), Q ([A-C3 H6 O2 ]+ ), I ([A-C6 H6 O]+ ), and J ([I-MeOH]+
我们已经通过精确质量电喷雾串联和多阶段(MSn)质谱结合计算化学估计的热化学数据,研究了质子化的苯并呋喃新木脂(BNs)和二氢苯并呋喃新木脂(DBNs)的气相裂解反应。大多数质子化的化合物碎片成产物离子B([M + H-MeOH] +),C([B-MeOH] +),D([C-CO] +)和E([D-CO] + )碰撞诱导解离(CID)。但是,我们确定了一系列诊断离子并将它们与特定的结构特征相关联。如果化合物在C-4处显示乙酰氧基,则产物离子C生成诊断离子K([C-C2 H2 O] +),L([K-CO] +)和P([L-CO] +)。产物离子H([D-H2 O] +)和M([H-CO] +)的形成与C-3和C-3'处的羟基相关,而产物离子N([D-MeOH] +)和O([N-MeOH] +)在相同位置表示甲氧基。最后,产物离子F([A-C2 H2 O] +),Q([A-C3 H6 O2] +),I([A-C6