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Hydrogen-Deuterium Exchange in Basic Near-Critical and Supercritical Media: An Experimental and Theoretical Study

机译:基本近乎关键和超临界介质中的氢氘交换:实验和理论研究

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摘要

Treatment of homo- and heterocyclic aromatic substrates with basic deuterium oxide under near- or supercritical conditions results in rapid base-catalyzed hydrogen-deuterium exchange (HDE) in aromatic and benzylic positions. It has been postulated that HDE follows a simple deprotonation-reprotonation mechanism, but little evidence has been provided to date. This study correlates experimentally observed proton exchanges in n-butylbenzene with ab initio calculations of the acidities and potential energy (PE) profiles. In addition to providing further support for carbanion intermediacy in HDE, these results offer new insights into substrate acidities in near- and supercritical aqueous media and the optimal conditions required for their isotope exchange.
机译:在接近或超临界条件下用碱性氘氧化物处理含有碱性和杂环氧化物,导致芳族和苄基位置的快速碱催化的氢 - 氘交换(HDE)。 它已被假设HDE遵循简单的去除栓塞 - 再生机制,但迄今为止提供了很少的证据。 该研究将实验观察到的正丁烯的质子交换与酸性和潜在能量(PE)型材的AB初始计算相关。 除了在HDE中提供进一步支持碳中介质的支持外,这些结果还提供了近乎临时和超临界水性介质的基材酸性的新见解以及其同位素交换所需的最佳条件。

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