Ionic Liquid-Supported Photocatalysts: A Reusable Environmentally Friendly Oxidation Reaction System That Uses Air and Light.

Ionic liquids are used in various fields due to their unique physical properties and are widely utilized as reaction solvents in the field of synthetic organic chemistry. We have previously proposed a new organic synthetic method in which the catalyst and reaction reagents are supported on ionic liquids. This method has various advantages, such as the ability to reuse the reaction solvent and catalyst and its facile post-reaction treatment. In this paper, we describe the synthesis of an ionic liquid-supported anthraquinone photocatalyst and the synthesis of benzoic acid derivatives using this system. This synthesis of benzoic acid derivatives via the cleavage of vicinal diols by an ionic liquid-supported anthraquinone photocatalyst is an environmentally friendly process, and furthermore, it has a simple post-reaction process, and the catalyst and solvent can both be reused. To the best of our knowledge, this is the first report on the synthesis of benzoic-acid derivatives via the cleavage of vicinal diols using light and an ionic-liquid-supported catalyst.

Epoxidation of olefins using diaryltellurium dicarboxylates.

This paper reports an efficient method for the epoxidation of a variety of functionalized olefins using diaryltellurium dicarboxylates as hypervalent tellurium compounds. This method is able to efficiently convert olefins into epoxides using catalytic amounts of tellurium and urea hydrogen peroxide. Furthermore, we propose that this reaction proceeds via the formation of peroxides of phenol, carboxylic acid, and tellurium peroxide when diaryltellurium dicarboxylates and hydrogen peroxide react. This is the first example of an epoxidation reaction using hypervalent tellurium compounds.

Bis(2,6-diisopropylphenyl) tellurone: a well-defined monomeric diorganotellurone without cocrystallized solvents and without stabilizing intramolecular contacts.

Only two crystal structures of diorganotellurones have been reported to date, both of which contain cocrystallized solvents and one of which is stabilized by intramolecular Te-N secondary bonding interactions. This work describes the crystal structure of bis(2,6-diisopropylphenyl) tellurone, (C12H17)2TeO2 or C24H34O2Te, the first well-defined diorganotellurone without cocrystallized solvents and without stabilizing intramolecular contacts. The molecule has crystallographic twofold symmetry, with half the molecule as the asymmetric unit. The molecular structure is compared to previously reported tellurones and those computed at the density functional theory DFT/B3PW91 level. The molecules form two-dimensional layers as a result of a weak intermolecular hydrogen-bonding network. The layers are then stacked in an antiparallel manner to form the crystal packing structure. The Hirshfeld surface analysis was employed to visualize and quantify the intermolecular contacts in the molecular crystal structure, and the contribution of O...H and H...H interactions was found to be the dominating factor.

One-pot synthesis, structural analysis, and oxidation applications of a series of diaryltellurium dicarboxylates.

This paper presents a concise and efficient one-pot synthesis of a variety of functionalized diaryltellurium dicarboxylates. The method is based on a mild photosensitized oxygenation of cheap and readily available carboxylic acids. The molecular structures of the diaryltellurium dicarboxylates were determined unambiguously using single-crystal X-ray diffraction analysis. The thus obtained diaryltellurium dicarboxylates were used to study the oxidation of benzoin derivatives.