10.1039/b206101e
The study focuses on the synthesis and crystal structures of complexes involving 2-mercaptonicotinic acid (HnicSH) with palladium(II), platinum(II), rhenium(III), and molybdenum(VI) and (V). The chemicals used include 2-mercaptonicotinic acid, Pd(II), Pt(II), Re(III), Mo(VI), and Mo(V) salts, as well as ligands like PPh3 (triphenylphosphine) and bipy (2,2'-bipyridine). These chemicals serve to form new complexes, which are characterized by vibrational spectroscopy and NMR. The study aims to understand the coordination modes of the ambidentate ligand HnicSH, which can involve either the sulfur or nitrogen atoms in coordination with the metal centers. The complexes were found to exhibit different coordination modes, such as monodentate (S) and chelating (N,S), and were further investigated for their potential in oxygen atom transfer reactions, with the molybdenum complex showing catalytic activity towards the oxidation of benzoin and PPh3 with dmso.
10.1007/s00706-012-0724-6
The research aims to develop a greener and more efficient method for the one-pot synthesis of 1,2,4,5-tetraarylated imidazoles, which are important compounds found in natural products and pharmacologically active compounds with various therapeutic properties. The study introduces the use of anhydrous FePO4 (iron(III) phosphate) as a catalyst for the four-component condensation of benzil (or benzoin), aldehydes, amines, and ammonium acetate in refluxing ethanol. The purpose of this research is to overcome the disadvantages of previous methods, such as the use of expensive reagents, longer reaction times, and the generation of toxic waste. The conclusions drawn from the study highlight the efficiency of the new method, which not only yields excellent results but also avoids the problems associated with catalyst cost, handling, safety, and pollution. The chemicals used in the process include benzil or benzoin, aromatic aldehydes, aniline, ammonium acetate, and FePO4 as the catalyst. The research demonstrates that FePO4 is an eco-friendly, reusable, recyclable, and commercially available catalyst that simplifies the isolation and purification of the products through simple washing and crystallization of the crude products.
10.1021/ja01874a043
The study investigates the relative reactivities of methylmagnesium chloride and dimethylmagnesium, focusing on their interactions with various carbonyl compounds in different solvents. Methylmagnesium chloride and dimethylmagnesium are the primary reagents used, with dioxane and isoamyl ether serving as solvents. The researchers found that dimethylmagnesium exhibits a preference for reacting with hydroxyl groups over carbonyl groups, forming ene-diol magnesium salts and resulting in less reactivity toward carbonyl functions compared to methylmagnesium chloride. This was demonstrated through reactions with benzoin, acetophenone, desoxybenzoin, and diphenylacetophenone, where dimethylmagnesium showed lower yields and incomplete reactions. The study also highlights the influence of solvents on reaction outcomes and suggests that the presence of dioxane does not alter the reaction course significantly.
10.1021/acs.orglett.5b03240
The research aims to develop an efficient and straightforward method for synthesizing tetraaryl-substituted pyrroles, which are important luminophores with potential applications in organic electronic devices. Benzoin is a suitable precursor of desoxybenzoin and plays a crucial role in the acid-promoted cross-dehydrative aromatization reaction to synthesize tetraaryl-substituted pyrroles. The study introduces an acid-promoted cross-dehydrative aromatization reaction between benzoin and deoxybenzion, using acetic acid and ammonium acetate as key reagents. This transformation allows for the synthesis of various aryl group substituted tetraarylpyrroles with good to excellent yields. The researchers found that both electron-donating and electron-withdrawing substituents on the benzene ring of benzoin were well tolerated, and functional groups such as cyano and halogens were also compatible. The method was further extended to synthesize tetraaryl-substituted pyrroles with four different aromatic substituents. The study concludes that this approach provides a facile and highly efficient pathway for constructing unsymmetrical tetraaryl-substituted pyrroles, with potential for further functionalization and modification, such as N-alkylation and N-borylation, to enhance their photovoltaic properties.
10.1007/s00203-019-01623-1
The research investigates the biotransformation of benzoin to benzamide by the plant endophyte Sphingomonas sp. LK11 and its effects on the growth and stress tolerance of Cucumis sativus (cucumber). The study found that Sphingomonas sp. LK11 can convert benzoin to benzamide, which acts as an abiotic stress agent when applied to cucumber plants, reducing their agronomic potential. However, when the plants were inoculated with Sphingomonas sp. LK11 along with benzamide, the negative effects were mitigated, and the plants' growth and stress tolerance were improved. The inoculated plants showed higher levels of chlorophyll b and carotenoids, indicating enhanced photosynthetic capacity and stress tolerance. The study also revealed that Sphingomonas sp. LK11 could regulate oxidative stress by reducing the levels of peroxidase, catalase, and glutathione peroxidase in benzamide-treated plants. The findings suggest that Sphingomonas sp. LK11 has potential for plant growth promotion and stress tolerance through its biotransformation capabilities and its ability to modulate plant physiological processes.
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