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SCMNPs@Uridine/Zn: An efficient and reusable heterogeneous nanocatalyst for the rapid one-pot synthesis of tricyclic fused pyrazolopyranopyrimidine and 3-methyl carboxylate substituted pyrano[2,3-c]pyrazole derivatives under solvent-free conditions

Wei Jia, Gui Wenjun, Cui Yanjun, Zhang Zhifang, Yousif Qahtan A.

Polish Journal of Chemical Technology

2020

Vol. 22, nr 2

20--33

SCMNPs@Uridine/Zn is utilized as an environmental-friendly and efficient heterogeneous nanocatalyst for two one-pot four-component condensation reactions, containing hydrazine hydrate, arylaldehyde, ethyl acetoacetate, and barbituric acid to yield tricyclic fused pyrazolopyranopyrimidine derivatives (5a-q), and hydrazine hydrate, arylaldehyde, malononitrile, and dimethyl acetylenedicarboxylate/diethyl acetylenedicarboxylate to yield 3-methyl carboxylate substituted pyrano[2,3-c]pyrazole derivatives (8a-y) under solvent-free conditions with high to excellent yields. The main advantages of this process are easy work-up, short reaction times, no chromatographic purifications, and recyclability of the catalyst for a minimum of six runs without any signifcant decrease in yields of the products. Also, the prepared catalyst SCMNPs@Uridine/Zn was synthesized and fully characterized by various techniques including Fourier transform infrared spectroscopy (FT-IR), energy dispersive X-ray (EDX), thermogravimetric analysis (TGA), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and Raman spectroscopy.

Superoxo rhodium(III) complexes with higher carboxylic and amino-carboxylic acids as ligands

Moszner M., Ziółkowski J. J.

Polish Journal of Chemistry

1998

Vol. 72, nr 11

2357-2365

Replacement of H2O and/or OH(-) ligands in the [Rh2(O2(-))(OH)2(H2O)n](3+)cation by carboxylate ions: RCO2(-) (R=C2H5, C3H7, C4H9, (CH3)3), glycine, L-aspartic acid and L-proline have been studied by electronic and ESR spectra. Two new superoxo rhodium(III) carboxylates formulated as [Rh2(O2(-))(OH)(RCO2)4]n, (R=C2H5 (1), C3H7 (2)), have been synthesized in the reaction between the rhodium (III) superoxo hydroxide, assumed to be [Rh2(O2(-))(OH)2+m(H2O)n-m] with RCO2H. Reaction products were characterized by elemental analysis, UV-VIS, IR, ESR spetroscopies and magnetic susceptibility measurements. The results indicated the formation both the superoxo rhodium(III) carboxylates and amino-carboxylates, containing the [Rh2(O2(-))]5+ core of higher stability in the compounds with the amino-carboxylic acid anions.