Back Cover: Lactonization of C(sp²)—H Bonds in Enamides with CO₂ (Chin. J. Chem. 5/2018)

Abstract

The back cover picture shows a novel synthesis of 1,3‐oxazin‐6‐ones from enamides with CO2 through C—H carboxylation and one‐pot cyclization. The concept of “CO2 = CO + O”, using CO2 to replace toxic CO and stoichiometric oxidant, guilds the development of this chemistry as well as green and safe synthetic methods in the future. More details are discussed in the article by Yu et al. on page 430–436.

Recent progress in analytical capillary isotachophoresis

“…With the optimized electrolyte system (BGE = LE: 10 mM ammonium carbonate, 10 mM ammonium borate, 1.0 M dye, 0.0125% polyethyleneoxide, pH 9.8; TE = sample solution: 100 mM glycine, 6.4 mM Tris, 0.0125% polyethyleneoxide, pH 8.0), a LOD of 0.783 mM digoxin was reached. Huang and co-workers [60] developed a new method for the determination of mercapto compounds, including pre-column derivatization combined with acid-induced tITP stacking. Mercapto compounds were derivatized with 2-chloro-1-methylpyridinium iodide in Tris-HCl buffer at pH 8.15 (TE: Tris + ).…”

Synthesis, Nematicidal Activity, and 3D‐QSAR of Novel 1,3,4‐Oxadiazole/ Thiadiazole Thioether Derivatives

“…[27,28] Ethyl 2-phenoxyacetates (12.0 mmol) was reacted with 80% hydrazine hydrate (13.2 mmol) in ethanol (30 mL) to afford pure substituted 2-phenoxyacetohydrazide (2a-2p). [29,30] Carbon disulfide (11.2 mmol) was dropwise added into the mixture of various 2-phenoxyacetohydrazide (7.5 mmol) and KOH (11.2 mmol) in ethanol (20 mL), and refluxed for 8-10 h. After the reaction was completed, the solvent was removed under reduced pressure. Then, water was added and the precipitate was removed by filtration to afford yellowish transparent liquid.…”

Penta‐Nuclear Fe(III) Cluster: Synthesis, Structure, Magnetic Properties and Hirshfeld Surface Analysis

“…Complex 1 constructed a dimer through double π⋅⋅⋅π interactions (the distance between the plane of Cg17 and the plane of Cg10 D is 3.410 Å (symmetry code: (D) 1 -x, 1 -y, 1 -z. Figure 2) [43,44] which further formed a 2D plane through the π⋅⋅⋅π interactions( Figure S1). It must be noted that the lattice water molecules were stand through hydrogen bonds.…”