A biradical oxo-molybdenum complex containing semiquinone ando-aminophenol benzoxazole-based ligands

Abstract

Biradical molybdenum(iv) complex, MoOLBISLSQ, has been prepared from the reaction of the o-iminosemibenzoquinone form of a tridentate non-innocent benzoxazole ligand, LBIS, and MoO2(acac)2 and used as catalyst in oxidation reaction..

Slicing the π in Three Unequal Pieces: Iridium Complexes with Alkyne, Iminoxolene, and Dioxolene Ligands

“…However, structural data for complexes containing multiple classes among iminoxolenes, dioxolenes, and alkynes are scarce. A few compounds contain both dioxolene and iminoxolene ligands, − but the only compound of which we are aware with an alkyne and an iminoxolene or dioxolene ligand is inapposite because it contains bridging rather than terminal catecholates …”

Pyridylidene Amide Ru Complex for Selective Oxidation in Organic Synthesis

“…In summary, these substrate conversions indicate an exquisite functional group tolerance of complex 1 in sulfide oxidation, including primary and benzylic alcohols, esters, aldehydes, amines, imines, nitriles, nitro and halide functionalities, and heterocycles. Of note, neither heterocycle nor amine, thiol, or benzylic alcohol functional group tolerance has been demonstrated with other catalytic systems such as high-valent molybdenum complexes . Tolerance to these functional groups, ubiquitous in compounds for agricultural and pharmaceutical application, is particularly attractive for late-stage oxidation of complex molecular structures as demonstrated here with the one-step synthesis of Dapsone.…”

“…Likewise, they are key functional entities in herbicides, e.g., in Mesotrione or Cafenstrole . A general challenge in the preparation of sulfones from sulfides is often the incomplete oxidation. , Full oxidation has been achieved with carbon nanotubes-Ru and NaIO 4 and with different high-valent molybdenum systems and organocatalyzed with the use of ozone . While ozone is inconvenient as the terminal oxidant due to its hazardous properties, NaIO 4 constitutes a suitable alternative that is also potentially applicable for large scale preparations …”