Stable Singlet Carbenes as Organic Superbases
Stable Singlet Carbenes as Organic Superbases
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作为有机超碱的稳定单线态卡宾
DOI:
10.1002/anie.202111588
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Bertrand, Guy
中科院分区:
文献类型:
--
作者:
Vermersch, François;Yazdani, Sima;Junor, Glen P.;Grotjahn, Douglas B.;Jazzar, Rodolphe;Bertrand, Guy
A simple experimental procedure for scaling carbene Brønsted basicity is described. The results highlight the strong basicity of pyrazol‐4‐ylidenes, a type of mesoionic carbene, also named cyclic‐bentallenes (CBA). They are more basic (pKaH>42.7 in acetonitrile) than the popular proazaphosphatrane Verkade bases, and even the Schwesinger phosphazene superbase P4(tBu). The basicity of these compounds can readily be tuned, and they are accessible in multigram quantities. These results open new avenues for carbon centered superbases.