A simple azine-linked covalent organic framework (COF) with high thermal and chemical stabilities has been prepared by using deep eutectic solvent (DES) as green media. The as-synthesized COF was employed as heterogeneous ligand for immobilization of PdII. The obtained Pd-supported COF nanoparticles catalyst (defined as Pd/TFPT-Azine-COF) was found to be an efficient heterogeneouscatalyst for the
Metal-Free Aromatic Carbon–Phosphorus Bond Formation via a Sandmeyer-Type Reaction
作者:Shuai Wang、Di Qiu、Fanyang Mo、Yan Zhang、Jianbo Wang
DOI:10.1021/acs.joc.6b01820
日期:2016.12.2
proceeds smoothly at room temperature without the exclusion of moisture or air. This phosphorylation reaction tolerates a wide range of functional groups and affords the phosphorylation products in moderate to good yields, thus providing a valuable method for the formation of aromatic carbon–phosphorus bonds.
Tf<sub>2</sub>O/DMSO-mediated dual activation of aryl phosphinate to access various aryl phosphonates
作者:Hui-Qi Yue、Da-Wei Shi、Ming Li、Si-Qi Gao、Mu-Xin Sun、Shun Zhang、Shang-Dong Yang、Bin Yang
DOI:10.1039/d3cc03250g
日期:——
A metal-free method for the dual activation of aryl phosphinate has been developed; the P–H and P–O bonds are sequentially activated by the Tf2O/DMSO system. Without the requirement of metals and unstable P-reagents, this one-pot procedure provides a convenient and practical access to a variety of aryl phosphonates. A mechanism involving twice generation of electrophilic P-species and two SN-processes
Michaelis–Arbuzov reaction of carboxylicacids and triaryl phosphites for preparing arylphosphonates under anhydride-free conditions has been reported. In this context, triaryl phosphites serve as both reagents for activating the carboxylicacids and substrates for the reaction. There have been no reports to date of efficient and direct methods for the in situ activation of carboxylicacids using triaryl phosphites