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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Gas-Phase Specific Reactivity of Isomeric 1,3-Benzodithiole Anions: Tandem Mass Spectrometry and DFT Theoretical Studies
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Gas-Phase Specific Reactivity of Isomeric 1,3-Benzodithiole Anions: Tandem Mass Spectrometry and DFT Theoretical Studies

机译:1,3-苯二硫杂异构体阴离子的气相比反应性:串联质谱和DFT理论研究

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摘要

1,3-Benzodithiole dideuterated at the dithioacetal carbon atom has been ionized in the chemical ionization source of a tandem triple quadrupole mass spectrometer under NICI condition. Two isomeric anions are formed by abstraction of an o-phenylic proton or through abstraction of a deuteron. The fragmentation patterns occurring under dissociative collisions differ and confirm the coexistence of two nonconverting carbanions. DFT calculations show that the dithioacetal anion is more stable than the phenylic. The nucleophilic reactivity toward CS_2 has been studied by collision-induced reactions in the collision cell of the tandem instrument. Both isomeric anion forms display characteristic fragmentations of the resulting [(M-H(D? + CS_2] adduct anions, demonstrating a difference in reactivity: the dithioacetal anion reacts regioselectively at C and the o-phenylic at S. DFr calculations, performed with the aim of rationalizing this observed difference and understanding the formation of the diagnostic fragments, have been successful.
机译:在NICI条件下,在串联三重四极杆质谱仪的化学电离源中,在二硫缩醛碳原子上复出的1,3-苄二硫已被电离。两个异构的阴离子是通过邻苯基质子的抽象或氘核的抽象而形成的。在解离碰撞下发生的碎裂模式不同,并证实了两种非转化碳负离子的共存。 DFT计算表明,二硫缩醛阴离子比苯基阴离子更稳定。在串联仪器的碰撞池中,通过碰撞诱导的反应研究了对CS_2的亲核反应性。两种异构体阴离子形式均显示出所得[[MH(D?+ CS_2]加成阴离子)的特征性片段,证明了反应性的差异:二硫代乙缩醛阴离子在C时发生区域选择性反应,在S. DFr计算中发生邻苯基反应,旨在达到目的。使观察到的差异合理化和理解诊断片段的形成的方法已经成功。

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