Gas-phase ion/molecule isotope-exchange reactions: methodology for counting hydrogen atoms in specific organic structural environments by chemical ionization mass spectrometry
作者:Donald F. Hunt、Satinder K. Sethi
DOI:10.1021/ja00543a009
日期:1980.11
Ion/molecule reactions are described which facilitate exchange of hydrogens for deuteriums in a variety of different chemical environments. Aromatic hydrogens in alkylbenzenes, oxygenated benzenes, m-toluidine, m-phenylenediamine, thiophene, and several polycyclic aromatic hydrocarbons and metallocenes are exchangedunder positive ion CI conditions by using either D/sub 2/O, EtOD, or ND/sub 3/ as the
描述了在各种不同的化学环境中促进氢与氘交换的离子/分子反应。使用 D/sub 2/O、EtOD 或 ND/sub 3/ 在正离子 CI 条件下交换烷基苯、氧化苯、间甲苯胺、间苯二胺、噻吩和几种多环芳烃和茂金属中的芳香氢作为反应气。在负离子 CI 条件下,芳族氢、苄基氢和与羰基相邻的碳上的氢分别在 ND/sub 3/、D/sub 2/O 和 EtOD 中发生交换。讨论了交换过程的可能机制。1张图,2张桌子。
Fourier transform mass spectrometric generation and studies of carboethoxycarbene anion radical (EtOCOCH.cntdot.-)
作者:A. Kasem Chowdhury、Charles L. Wilkins
DOI:10.1021/ja00191a006
日期:1989.4
anion radical, EtOCOCHsup sm bullet}minus}}. Upon collision-induced dissociation, EtOCOCHsup sm bullet}minus}} appears to eliminate Csub 2}Hsub 4} via a six-membered transition state yielding an ion with m/z 58. Two resonance structures, a carbon-centered radical anion (I) and an oxygen-centered anion (II), can be considered in order to understand the reactivity of EtOCOCHsup sm bullet}minus}}
与流动余辉研究的结果相反,在傅里叶变换质谱仪中与重氮乙酸乙酯的电子附着产生大量的碳乙氧基卡宾阴离子自由基,EtOCOCHsup sm bullet}minus}}。在碰撞诱导解离时,EtOCOCHsup sm bullet}minus}} 似乎通过六元过渡态消除 Csub 2}Hsub 4},产生 m/z 58 的离子。两个共振结构,可以考虑以碳为中心的自由基阴离子 (I) 和以氧为中心的阴离子 (II),以了解 EtOCOCH sup sm bullet}minus}} 的反应性。EtOCOCHsup sm bullet}minus}} 与羰基化合物和活化烯烃的反应可以通过考虑以碳为中心的自由基阴离子 (I) 做出更大贡献来合理化。使用包围法,EtOCOCHsup sm bullet}minus}} 的质子亲和力确定为 377.2 plus minus}
Fragmentation of (η5-C5H5)Fe(CO)(PPh3)(COCH2COR) complexes to the cation [(η5-C5H5)Fe(CO)2(PPh3)]+
作者:Stephen G. Davies、Oliver Watts、Nurgun Aktogu、Hugh Felkin
DOI:10.1016/s0022-328x(00)98563-2
日期:1983.2
The unstable iron complexes (η5-C5H5)Fe(CO)(PPh3)(COCH2COR) (R = H, Me, Ph, OEt) undergo facile fragmentation with carboncarbon bond cleavage to generate the iron carbonyl cation [(η5-C5H5)Fe(CO)2(PPh3)]+ and the corresponding carbanion RCOCH2−.