Destabilized Carbocations Caged in Water Microdroplets: Isolation and Real-Time Detection of <i>α-</i>Carbonyl Cation Intermediates
作者:Anubhav Kumar、Supratim Mondal、Sandeep、Paloth Venugopalan、Anil Kumar、Shibdas Banerjee
DOI:10.1021/jacs.1c12644
日期:2022.3.2
proposals of α-carbonyl cation intermediates have been driven by chemical intuition and indirect evidence. Recently, wide interest in α-carbonyl cation chemistry has opened new gates to prepare α-functionalized carbonyl compounds. Though these intrinsically unstable carbocations are formed under forcing conditions (e.g., in a strong acid medium), their fleeting existence prohibits direct observation
在过去的 50 年中,α-羰基阳离子中间体的提议一直受到化学直觉和间接证据的推动。最近,对α-羰基阳离子化学的广泛兴趣为制备α-官能化羰基化合物打开了新的大门。尽管这些本质上不稳定的碳正离子是在强迫条件下(例如,在强酸介质中)形成的,但它们的短暂存在阻碍了直接观察或光谱测量。我们报告说,高速水性微滴在用相应的反应等分试样轰击时,可以直接从各种反应(弗里德尔-克拉夫茨芳基化、脱氧和叠氮化)中捕获 α-羰基阳离子中间体。然后将笼罩在水滴中的 α-羰基阳离子解吸到气相中,从而通过质谱法成功测量。