An NHC‐Stabilised Phosphinidene for Catalytic Formylation: A DFT‐Guided Approach
作者:P. Sreejyothi、Kalishankar Bhattacharyya、Shiv Kumar、Pradip Kumar Hota、Ayan Datta、Swadhin K. Mandal
DOI:10.1002/chem.202101202
日期:2021.8.11
In recent years, the applications of low-valent main group compounds have gained momentum in the field of catalysis. Owing to the accessibility of two lonepairs of electrons, NHC-stabilised phosphinidenes have been found to be excellent Lewis bases; however, they cannot yet be used as catalysts. Herein, an NHC-stabilised phosphinidene, 1,3-dimethyl-2-(phenylphosphanylidene)-2,3-dihydro-1H imidazole
近年来,低价主族化合物在催化领域的应用得到了蓬勃发展。由于两个孤对电子的可及性,已发现 NHC 稳定的膦亚基是极好的路易斯碱;然而,它们还不能用作催化剂。在此,报道了一种 NHC 稳定的膦亚基,1,3-二甲基-2-(苯基亚膦基)-2,3-二氢-1 H咪唑 (1),用于活化 CO 2。对 CO 2活化的仔细检查通过 DFT 计算以及本征键轨道分析的过程表明,膦亚基通过两个苯环之间的非共价 π-π 相互作用与苯基硅烷相关联,这激活了 Si-H 键,促进了氢化物转移到 CO 2分子。详细的 DFT 研究与光谱实验相结合,以了解 CO 2活化的机制及其催化还原官能化,导致一系列化学惰性伯酰胺在温和反应条件下甲酰化。
Metal-Free Catalytic Formylation of Amides Using CO<sub>2</sub>under Ambient Conditions
作者:Pradip Kumar Hota、Samaresh Chandra Sau、Swadhin K. Mandal
DOI:10.1021/acscatal.8b04023
日期:2018.12.7
This study reports the metal-free formylation of amides using carbon dioxide under ambient conditions. An abnormal N-heterocyclic carbene (aNHC) acts as an efficient catalyst for the formylation of amides in the presence of hydrosilane at room temperature. This methodology enables the formation of a C–N bond and can be utilized in building up core moieties of two natural products having strong larvicidal
extensive use in biomolecules, inorganic compounds, and organic compounds. Traditional methods for imide synthesis often rely on the use of toxic or expensive oxidizingagents, limiting their sustainability and practicality. Herein, we present a green and environmentally friendly approach for the synthesis of imides from N-alkylamides usingelectrocatalyticoxidation with H2O as the green oxygen source