Natural Product Synthesis
The use of ortho-quinone methides in synthesis is increasing year on year. With this growth, the variety of ways in which these intermediates are being generated has also diversified, and it seems unlikely that a single initiation method will emerge as the strategy of choice. See the Minireview on page 9160 ff. by C. D. Bray and N. J. Willis for an up-to- date account on the latest developments in this field of chemistry.
In their Communication on page 9174 ff., summary, Y. Wei, T. Liu et al. show that amphiphilic hybrid hexavanadates are highly efficient emulsion catalysts with high stability for deep oxidation desulfurization. The hybrids can be used as amphiphiles to create emulsions with the catalytically active hexavanadate head-groups distributed at the water–oil interface. The pH of the aqueous phase and the hydrophobicity of alkyl tails on the hybrids both play key roles in controlling the size of emulsion and the formation of reverse emulsions, which consequently determine the reaction rate.
In their Full Paper on page 9230 ff. M. Kanehara, T. Teranishi et al. describe a new method for the synthesis of high-quality CdS and Cu7S4 quantum dots (QDs) by using N,N-dibutylthiourea (DBTU) as a sulfur source. The disk-shaped Cu7S4 QDs as schematically shown can be used effectively as templates to form cation-exchanged monodisperse disk-shaped CdS QDs.