Synthesis, X-ray Geometry, and Anodic Behavior of Tris[2-(hydroxymethyl)phenyl]phosphane
摘要:
Tris[(monohydroxymethyl)phenyl]phosphane 5a and 5b were prepared, and the geometry of the ortho-isomer 5a was determined by X-ray diffraction. 5a was found to be propeller-like in shape, exhibiting a helical conformation with the three hydroxymethyl substituents standing on the same side as that with the phosphorus lone pair. Phosphanes 5a and 5b underwent electrochemical one-electron oxidation, giving rise to nonpersistent phosphoniumyl cation radicals 5a(.+) and 5b(.+). The low value of the anodic peak potential of 5a was explained by the fast decay of 5a(.+), which was rapidly rearranged to a phosphoranyl radical through the formation of a strong P-.-O bond. The fast oxidation of this intermediate phosphoranyl radical followed by a second cyclization led to the 1-[2-(hydroxymethyl)phenyl]spirobi[1H,3H-2,1-benzoxaphosphole] 7a, which was isolated in significant yield.
synthesis of MNPs still represents a challenging task. In this work, we revealed a strong solvent effect on the growth of palladium nanoparticles (PdNPs), which was directed by a porous [2 + 3] organic molecularcage (OMC, Phos-cage) containing triphenylphosphine moieties. PdNPs with different average diameters of 0.8, 1.2, and 3.3 nm supported by Phos-cage were obtained by simply varying the reaction media
Enhancing the activity, selectivity, and recyclability of Rh/PPh3 system-catalyzed hydroformylation reactions through the development of a PPh3-derived quasi-porous organic cage as a ligand
contrast to heterogeneous network frameworks (e.g., covalentorganicframeworks and metal-organic frameworks) and porous organic polymers, porous organic cages (POCs) are soluble molecules in common organic solvents that provide significant potential for homogeneous catalysis. Herein, we report a triphenylphosphine-derived quasi-porous organic cage (denoted as POC-DICP) as an efficient organic molecular