4917-76-4Relevant articles and documents
Direct NMR detection of the unstable "red product" from the reaction between nitroprusside and 2-mercaptosuccinic acid
Gao, Yin,Mossing, Brendan,Wu, Gang
, p. 20338 - 20343 (2015)
The reaction between nitroprusside (NP, [FeII(CN)5NO]2-) and organic thiolates (RS-) in aqueous solution has long been known to produce an unstable red intermediate thus often being referred to as the "red product" (RP) in the literature. While RP has always been formulated as [FeII(CN)5N(O)SR]3-, it is rather difficult to study it in aqueous solution because it is not only unstable but also exhibits rapid ligand exchange. All previous studies of RP have relied on UV-vis, IR, kinetics measurements, and analysis of decomposed products. Herein we report the first comprehensive multinuclear (1H, 13C, 15N, and 17O) NMR characterization of the RP produced from the reaction between NP and 2-mercaptosuccinic acid (MSA). The NMR chemical shifts obtained for the RP are compared with those from the free ligand (S-nitrosothiol, RS-NO) prepared in situ by the reaction of MSA with NaNO2. We also showed that useful thermodynamic and kinetic properties of RP formation can be readily obtained from 1H NMR studies.
A magnetically retrievable heterogeneous copper nanocatalyst for the synthesis of 5-substituted tetrazoles and oxidation reactions
Darabi, Mitra,Tamoradi, Taiebeh,Ghadermazi, Mohammad,Ghorbani-Choghamarani, Arash
, p. 703 - 710 (2017/10/07)
Abstract: A copper complex anchored on functionalized Fe3O4 nanoparticles was prepared by a simple and inexpensive procedure using commercially available materials. The prepared catalyst was characterized by a range of physical and spectroscopic techniques. Ease of operation, high efficiency, eco-friendly procedure, easy separation of the catalyst and reusability for several consecutive runs without significant loss of its activity are several advantages of this catalyst. The catalytic activity has been explored for the oxidation of sulfides, oxidative coupling of thiols and synthesis of 5-substituted tetrazoles. Graphical Abstract: A magnetically retrievable heterogeneous copper nanocatalyst for the synthesis of 5-substituted tetrazoles and oxidation reactions[Figure not available: see fulltext.].