2253-67-0Relevant academic research and scientific papers
Magnetically recoverable ferromagnetic 3D hierarchical core-shell Fe3O4@NiO/Co3O4 microspheres as an efficient and ligand-free catalyst for C–S bond formation in poly (ethylene glycol)
Vatandoust Namanloo, Ahad,Akhlaghinia, Batool,Mohammadinezhad, Arezou
, p. 446 - 461 (2020/05/13)
A simple and efficient protocol for the synthesis of diaryl thioethers from the reaction of thiourea with a wide variety of aryl halides, including aryl iodides, aryl bromides and aryl chlorides in the presence of 3D hierarchical core-shell Fe3O4@NiO/Co3O4 microspheres has been described. This reaction enables the one-pot synthesis of diaryl thioethers in good to high yields using a non-toxic and magnetically separable catalyst in PEG-400 as an eco-friendly, safe, inexpensive and thermally stable solvent. Magnetic separation and reusability of catalyst for eight times without any significant loss of activity, the use of a commercially available, eco-friendly, cheap and chemically stable sulfur transfer agent and solvent, operational simplicity, environmentally benign, easier work-up procedure and cost efficiency make this method a promising candidate for potential applications in some organic reactions. The catalytic activity of Fe3O4@NiO/Co3O4 as a novel and inexpensive catalyst was investigated in the C-S cross coupling reaction.
Reactions of Meldrum's Acid with Isocyanates and Isothiocyanates
Augustin, Manfred,Guenther, Eckhard
, p. 1005 - 1015 (2007/10/02)
Meldrum's acid (1) reacts with isothiocyanates and LiH as base, yielding after alkylation the ketene-S,N-acetales 3, 4 and 5.Protonation of the lithium-thiolate 2 gives the thioamides 7 with tautomers 8, which can be methylated with diazomethane to 9.From
REACTIONS OF AROMATIC NITRO COMPOUNDS. LXIII. REACTION OF POLYNITRODIPHENYL SULFOXIDES WITH ACETONE IN AN ALKALINE MEDIUM
Alekhina, N. N.,Gitis, S. S.,Grudtsyn, Yu. D.
, p. 62 - 64 (2007/10/02)
Under the conditions of the Yanovskii reaction at room temperature 2,4-dinitrophenyl 4-nitrophenyl sulfoxide and bis(2,4-dinitrophenyl) sulfoxide undergo disproportionation to the corresponding sulfides and sulfones.The sulfides give isomeric acetonate ?
Nucleophilic Aromatic Substitution promoted by Lipophilic Quaternary Onium Salts under Phase-transfer Conditions and in Low Polarity Anhydrous Solvents. A Kinetic Study
Landini, Dario,Maia, Angelamaria,Montanari, Fernando
, p. 461 - 466 (2007/10/02)
A kinetic study of aromatic nucleophilic substitutions by N3(1-) and SCN(1-) has been carried out under phase-transfer catalysis (p.t.c.) conditions and in anhydrous chlorobenzene in the presence of hexadecyltributylphosphonium azide and thiocyanate.Under p.t.c. conditions, reactions follow a pseudo-first-order kinetic equation, and kobs is linearly related to the nucleophile concentration in the organic phase.In most reactions, the rate-determining step is attack by the nucleophile on the substrate.However in a few cases the process is controlled by diffusion ofthe anions through the interface.Passing from p.t.c. conditions to chlorobenzene solution leads to 5-7- and 2-3-fold increases in reaction rates with N3(1-) and SCN(1-), respectively.This behaviour is analogous to that observed in the aliphatic series, and is probably due to the limited number of water molecules accompanying the anions in the organic phase under p.t.c. conditions.Nucleofugicity scales are related to the polarizability of the nucleophile, and with N3(1-) and SCN(1-) they are F>>Br>=I>=Cl and Br>I>F>=Cl, respectively.Reaction products, including those derived from successive decomposition of N3 and SCN groups, have been identified.
Diaryl Sulfide Cleavage by Sodium Sulfide in Dipolar Aprotic Solvents
Evans, Thomas L.,Kinnard, Richard D.
, p. 2496 - 2499 (2007/10/02)
The interaction of sodium sulfide with diaryl sulfides that possess electron-withdrawing substituents (e. g., cyano or nitro) on the aromatic rings results in cleavage of the thioether and the formation of sodium aryl sulfides in dipolar aprotic solvents.Exchange reactions between these diaryl sulfides and sodium aryl sulfides are also observed in dipolar aprotic solvents.The cleavage and exchange reactions were employed to prepare mixed diaryl or alkyl aryl sulfides from symmetrical diaryl sulfides.
