%0 Journal Article
%T Preparationandcharacterizationofnano-CaObasedoneggshellwaste£ºNovelandgreencatalyticapproachtohighlyefficientsynthesisofpyrano[4,3-b]pyrans
%A Elaheh Mosaddegh
%A Asadollah Hassankhani
%J ´ß»¯Ñ§±¨
%P 351-356
%D 2014
%R 10.1016/S1872-2067(12)60755-4
%X £¿Nano-CaOwaspreparedbycalcinationofball-milledchickeneggshellwaste.Thisnovel,bioactive,heterogeneouscatalyst,whichhadhighcatalyticactivityandreusability,wasusedinthegreensynthesisofpyrano[4,3-b]pyransviacondensationofvariousaromaticaldehydes,malononitrile,and4-hydroxy-6-methyl-2H-pyran-2-oneat120¡æundersolvent-freeconditions.Thereactionproceededtocompletionwithin5-45minin93%-98%yield.Thenano-CaOwasfullycharacterizedbyscanningelectronmicroscopy,X-raypowderdiffraction,infraredspectroscopy,X-rayfluorescencespectroscopy,andthermalgravimetric,surfacearea,andelementalanalyses.
%K Nano-calciumoxide
%K Eggshellwaste
%K Biocatalyst
%K Pyrano[4
%K 3-b]pyrans
%K Ball-mill
%U http://www.chxb.cn/CN/abstract/abstract21256.shtml