Efficient condensation of resorcinol and various aromatic aldehydes in the presence of RuCl_3nH_2O as a homogeneous catalyst under reflux conditions was investigated.It was found that a very simple method afforded goo...Efficient condensation of resorcinol and various aromatic aldehydes in the presence of RuCl_3nH_2O as a homogeneous catalyst under reflux conditions was investigated.It was found that a very simple method afforded good to excellent yields of the desired products.展开更多
Molybdenum（ Ⅵ ） is a biologically essential trace element and its role in an extremely wide variety of systems has been reported. Most common methods often fail to determine trace Mo （ Ⅵ ） in the analysis of mol...Molybdenum（ Ⅵ ） is a biologically essential trace element and its role in an extremely wide variety of systems has been reported. Most common methods often fail to determine trace Mo （ Ⅵ ） in the analysis of molybdenum-containing samples, due to limitations such as inadequate detection limits and matrix interference, which make the direct determinations impossible. To solve this problem, various approaches are employed to concentrate and separate Mo（ Ⅵ ） to detectable levels. Concentration and separation methods play a main role in the analysis of trace Mo（Ⅵ）. Therefore, many separation and preconcentration procedures have been developed for the determination of Mo （ Ⅵ ）.展开更多
基金the Research Council of University of Guilan for their partial support
文摘Efficient condensation of resorcinol and various aromatic aldehydes in the presence of RuCl_3nH_2O as a homogeneous catalyst under reflux conditions was investigated.It was found that a very simple method afforded good to excellent yields of the desired products.
基金Supported by the Natural Science Foundation of Henan Province(No.0511020500).
文摘Molybdenum（ Ⅵ ） is a biologically essential trace element and its role in an extremely wide variety of systems has been reported. Most common methods often fail to determine trace Mo （ Ⅵ ） in the analysis of molybdenum-containing samples, due to limitations such as inadequate detection limits and matrix interference, which make the direct determinations impossible. To solve this problem, various approaches are employed to concentrate and separate Mo（ Ⅵ ） to detectable levels. Concentration and separation methods play a main role in the analysis of trace Mo（Ⅵ）. Therefore, many separation and preconcentration procedures have been developed for the determination of Mo （ Ⅵ ）.
