Song Z.,Center for Science and Technology Experiment |
Wan X.,Bohai University |
Zhao S.,Bohai University
Indian Journal of Chemical Technology | Year: 2012
A highly efficient synthesis of mono- and disubstituted 2,3-dihydro-quinazolin-4(1H)-ones has been performed by the condensation of isatoic anhydride, aldehydes, and ammonium salts or amines in EtOH/H 2O under reflux. A novel water-tolerant Lewis acid, cobalt m-nitrobenzenesulfonate, has been prepared and applied as a favorable catalyst in this one-pot three-component cyclocondensation reaction. The optimal amounts of catalyst and solvent are investigated. Experimental results show that only 3 mol% catalyst is enough to induce the conversion and EtOH/H 2O [1/3 (v/v)] system is observed as the best choice. All the reactions are performed within a short reaction time and the catalyst is easily recovered and recycled. The structures of new compounds are characterized by IR, 1H NMR, 13C NMR, MS and elemental analysis. A mechanism to rationalize the reaction is proposed.
Zhang Y.,Center for Science and Technology Experiment |
Liu L.,Center for Science and Technology Experiment |
Ying J.,Center for Science and Technology Experiment |
Qian J.,Center for Science and Technology Experiment |
Wang L.,Center for Science and Technology Experiment
Materials Letters | Year: 2013
The ternary metal chalcogenide ZnIn2S4 flower-like hollow microsphere was synthesized by a solvothermal reaction of Zn(CH 3COO)2·2H2O, InCl3· 4H2O and l-cysteine in ethylene glycol at 160 C for 24 h. The crystal structure was characterized by X-ray diffractometry. Field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analyses show that the products consist of hollow microspheres made up of nanosheets and the thickness of the nanosheets is found to be less than 10 nm. A possible mechanism for the formation of the flower-like hollow microspheres is also proposed in this paper. © 2013 Elsevier B.V.