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首页> 外文期刊>Chemistry: A European journal >Evidence for Direct Hydride Delivery from Formic Acid in Transfer Hydrogenation
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Evidence for Direct Hydride Delivery from Formic Acid in Transfer Hydrogenation

机译：在转移加氢中从甲酸直接提供氢化物的证据

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摘要

The regioselectivity of hydrometalation in transfer hydrogenation was investigated by tracing the fate of the deuterium label in both the formyl and carboxyl positions of formic acid during the isomerizaiton of a cis enol ether The deuterium from the formyl position is incorporated exclusively into the electron-deficient center of the double bond; this indicates that hydride attack occurs during transfer hydrogenation. The fact that the formyl hydrogen is more reactive than the carboxyl hydrogen suggests that the identities of the two hydrogens are not scrambled during transfer hydrogenation. We propose that the delivery of the ofrmyl hydrogen atom is concerted with decarboxylation rather than proceeding through the formationj of a metal dihydrido species.
机译：通过追踪顺式烯醇醚异构化过程中甲酸在甲酸的甲酰基和羧基位置的氘标记的命运，研究了加氢金属在转移氢化中的区域选择性。来自甲酰基位置的氘仅掺入缺电子中心双键的;这表明在转移氢化过程中发生了氢化物侵蚀。甲酰基氢比羧基氢具有更高的反应性这一事实表明，在转移氢化过程中，两个氢的特性不会加扰。我们提出，芳基氢原子的传递与脱羧作用相协调，而不是通过金属二氢物种的形成来进行。

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