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Dynamical Effects along the Bifurcation Pathway Control Semibullvalene Formation in Deazetization Reactions
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2018-01-16 00:00:00 , DOI: 10.1021/acs.jpcb.7b09533
Nilangshu Mandal 1 , Ayan Datta 1
Affiliation  

Post-transition-state dynamics during the deazetization of 3 resulting in two degenerate semibullvalenes (4 and 5) have been investigated with density functional theory (DFT) and quasi-classical trajectory (QCT) calculations. Removal of N2 from 3 occurs through a synchronous and concerted pathway through an ambimodal transition-state (TS1). In addition to TS2, the exclusively anticipated product from minimum energy pathway (MEP) calculations, trajectories initiated from TS1 produce 4, TS2, and 5 in 1:1:1 ratio. Isotopic substitutions (12C(13C/14C)-H(D) at 1–2 positions) result in purely Newtonian kinetic isotope effects (4:5 ≈ 1.4 for 13C113C2), an unequivocal evidence for dynamics controlled product formation.

中文翻译:

脱氮反应中沿分叉途径控制半布尔戊烯形成的动力学效应

用密度泛函理论(DFT)和准经典轨迹(QCT)计算研究了3脱氮过程中导致两个简并的半牛戊烯(45)的过渡后态动力学。从3中去除N 2的过程是通过双峰过渡态(TS1)的同步协同路径实现的。除了TS2之外,根据最小能量路径(MEP)计算得出的唯一预期产品,从TS1发出的轨迹还按1:1:1的比例产生4TS25。同位素取代(12C(13 C / 14 C)-H(d)在1-2的位置)导致纯粹牛顿动力学同位素效应(45 ≈1.4 13 Ç 1 - 13 Ç 2),用于控制动力学产物形成的明确的证据。
更新日期:2018-01-16
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