An efficient and new method for the synthesis of disulfides and sulfides via the reaction of aryl halides with ethyl potassium xanthogenate in the presence of MOF-199 is described. O-Ethyl-S-aryl ­carbonodithioate has a key role as an intermediate in this procedure; it was converted into symmetrical diaryl disulfides in DMF. Additionally, this could be applied to the synthesis of unsymmetrical aryl alkyl(aryl′) disulfides by the reaction with S-alkyl(aryl) sulfurothioates (Bunte salts) as well as unsymmetrical aryl alkyl(aryl′) sulfides in DMSO.

In the present study, Fe 2+ and Ni 2+ immobilized on hydroxyapatite-core-shell γ-Fe 2 O 3 (γ-Fe 2 O 3 @HAp-Fe 2+ and γ-Fe 2 O 3 @HAp-Ni 2+ ) with a high surface area has been synthesized and characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), and scanning electron microscope (SEM) techniques. Then, γ-Fe 2 O 3 @HAp-Fe 2+ and γ-Fe 2 O 3 @HAp-Ni 2+ were used as a new and magnetically recoverable nano catalyst for the selective oxidation of sulfides to sulfoxides with 33% aqueous H 2 O 2 (0.5 mL) as an oxidant at room temperature in good to excellent yields and short reaction time. Nontoxicity of reagent, mild reaction condition, inexpensive and high catalytic activity, simple experimental procedure, short period of conversion and excellent yields, and ease of recovery from the reaction mixture using an external magnet are the advantages of the present method.

O n e -P o t S y n t h e s i s o f S y m m e t r i c a l T r i t h i o c a r b o n a t e sAbstract: A novel and efficient, tetra-n-butylammonium hydroxide catalyzed, one-pot protocol has been developed for the synthesis of symmetrical trithiocarbonates from alkyl halides and carbon disulfide under neat aqueous conditions.

A facial, new, one-pot method for the preparation of symmetrical organic trithiocarbonates from various alkyl halides and carbon disulfide is described. This is a convenient, clean, and mild procedure, which involves the use of the neutral, nontoxic, commercially available, and inexpensive reagent NH 4 OAc in the preparation of the trithiocarbonate ion from carbon disulfide. K E Y W O R D Sammonium acetate, carbon disulfide, one-pot, neutral conditions, trithiocarbonates

Zn 3 (BTC) 2 metal-organic frameworks as recyclable and heterogeneous catalysts were effectively used to catalyze the synthesis of benzimidazole derivatives from o-phenylendiamine and aldehydes in ethanol. This method provides 2-aryl-1H-benzimidazoles in good to excellent yields with little catalyst loading. The catalyst was characterized using different techniques such as X-ray diffraction (XRD), energy dispersive X-ray (EDX) analysis, scanning electron microscopy (SEM), and Fourier transform infrared (FT-IR) spectroscopy.

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In various pharmaceutical and food industries, sulfite is utilized for the inhibition of nonenzymatic and enzymatic browning. Also, in brewing industries, it acts as an antioxidizing and antibacterial agent. Several toxic and adverse reactions, including vitamin deficiency, hypersensitivity, and allergic diseases, have been attributed to sulfite ingestion that may cause dysbiotic oral and gut microbiota events. Thus, the content of sulfite in foods must be controlled and monitored, and it is essential to find a specific, reproducible, and sensitive method to detect sulfite. Some analytical solutions are being tested to quantify sulfite. However, due to their advantage over traditional techniques, electroanalytical techniques are attracting much attention because they are simple, fast, affordable, and sensitive to implement. In addition, by the electrode modification, the morphology and size can be controlled, resulting in the miniaturization to be used in portable electrochemical devices. Therefore, the present review addressed some articles on the electrooxidation of sulfite from real samples using various electrochemical sensors.