Choline Peroxydisulfate: Environmentally Friendly Biodegradable Oxidizing TSIL for Selective and Rapid Oxidation of Alcohols

The choline- and peroxydisulfate-based environmentally benign biodegradable oxidizing task-specific ionic liquid (TSIL) choline peroxydisulfate (ChPS) was synthesized, characterized, and evaluated in terms of its oxidizing properties for the selective oxidation of alcohols to aldehydes/ketones under solvent-free mild reaction conditions without overoxidation to acid. FTIR spectra were used to establish the ionic structure of ChPS. The present ChPS was compared with metal (NH₄⁺, K⁺) peroxydisulfate and other oxidizing agents, and it was found that oxidation occurred in a short reaction time, with good to excellent yields. Physicochemical properties, such as density, thermal stability, viscosity, cyclic voltammetry, and solubility in common solvents, were determined. Biodegradability predictions using BIOWIN and the BOD₅ test, the antimicrobial activity test, and energy calculations indicated the excellent performance of choline peroxydisulfate as an effective oxidant

An Energy Efficient Sonochemical Selective Oxidation of Benzyl Alcohols to Benzaldehydes by Using Bio-TSIL Choline Peroxydisulfate

The present work deals with effective combination of ultrasonication (US) and biodegradable oxidizing task specific ionic liquid (bio-TSIL) choline peroxydisulfate monohydrate (ChPS·H₂O) for the selective oxidation of alcohols to aldehydes/ketones. The reactions were also conducted by using a thermal heating method (TH), and the comparative studies are provided to understand the effectiveness of the ultrasound process; it was observed that the use of ultrasound significantly reduces the reaction time from 30 to 5 min. Also, a substantial energy saving (>86%) was observed when the US method (0.125 kJ/g) was compared with the TH method (0.958 kJ/g). Bio-TSIL ChPS in water as an oxidant is found to be advantageous, as it is synthesized from biodegradable and nontoxic raw materials. Incorporation of an ultrasonic energy source along with the use of biodegradable raw materials for bio-TSIL makes the process not only green but also energy efficient

<i>m</i>‑CPBA Mediated Metal Free, Rapid Oxidation of Aliphatic Amines to Oximes

An efficient, rapid oxidation of various aliphatic amines to oximes using <i>m</i>-CPBA as an oxidant in ethyl acetate is described. High conversion (100%) with >90% oxime selectivity is achieved at room temperature under catalyst-free conditions. Mild reaction conditions along with an easy work up procedure offer lower byproduct formation and high selectivity for oximes in good yield and purity

Restriction of molecular twisting on a gold nanoparticle surface

To understand the photophysical properties of intramolecular charge transfer (ICT) and twisted intramolecular charge transfer (TICT) states on a gold nanoparticle (Au NP) surface, we have designed and synthesized a new coumarin molecule (C3) that exists both as ICT and TICT states in its excited state in a polar environment. On a Au NP surface, an excited C3 molecule only exists as an ICT state owing to restricted molecular rotation of a diethylamino group; as a result, no conversion from the ICT to TICT state was observed. Selection of the preferential state of a molecule with dual emitting states can be helpful for selected biological applications