%0 Journal Article
%T 无溶剂下磷钨酸镧催化合成5-亚烃基-2,2-亚丁基-1,3-二?f烷-4,6-二酮<br>Solvent-Free Synthesis of 5-Alkenyl-2,2-Butylidene-1,3-Dioxane-4,6-Diones with LaPW12O40 as Catalyst
%A 许招会
%A 熊斌
%A 雷志伟
%J -
%D 2013
%X 在LaPW12O40催化下,芳香醛和2,2-亚丁基-1,3-二?f烷-4,6-二.酮在无溶剂条件下合成了8种新型5-亚烃基-2,2-亚丁基-1,3-二?f烷-4,6-二酮.当催化剂的用量为5；(摩尔分数)时,室温反应20 ～40 min,收率为87.6；～94.3；.此外,还探讨了LaPW12O40的催化机理.该方法具有条件温和,反应时间短且收率高的优点.催化剂LaPW12O40对环境友好且可循环利用.<br>Eight kinds of 5-alkenyl-2,2-butylidene-1,3-dioxane-4,6-diones were synthesized by the Knoevenagel condensation reaction of aromatic aldehydes with 2,2-pentamethylene -1,3-dioxane-4,6-dione using LaPW12O40 as catalyst,without solvent.The results indicate that the yields ranged from 87.6%～94.3%,when using 5%( molar fraction)LaPW12O40 and reacting at room temperature for 20～40 min.Furthermore,a proposed reaction mechanism for the reaction catalyzed by LaPW12O40 was speculated.Compared to the classical Knoevenagel condensation reaction,the main advantages of the present procedure were milder conditions,shorter reaction time and higher yields,which afforded an effective method to synthesize 5-alkenyl-isopropylidene malonate derivatines.Further study showed that LaPW12O40 was environmentally friendly and reused for four times without any noticeable decrease in the catalytic activity
%K 2
%K 2-亚丁基-1
%K 3-二?f烷-4
%K 6-二酮
%K 磷钨酸镧
%K 芳香醛
%K 缩合反应<br>2 2-亚丁基-1 3-二?f烷-4 6-二酮 磷钨酸镧 芳香醛 缩合反应
%K 2 2-亚丁基-1 3-二?f烷-4 6-二酮 磷钨酸镧 芳香醛 缩合反应
%K 2 2-亚丁基-1 3-二?f烷-4 6-二酮 磷钨酸镧 芳香醛 缩合反应
%K 2 2-亚丁基-1 3-二?f烷-4 6-二酮 磷钨酸镧 芳香醛 缩合反应
%K 2 2-亚丁基-1 3-二?f烷-4 6-二酮 磷钨酸镧 芳香醛 缩合反应
%K 2 2-亚丁基-1 3-二?f烷-4 6-二酮 磷钨酸镧 芳香醛 缩合反应
%K 2 2-亚丁基-1 3-二?f烷-4 6-二酮 磷钨酸镧 芳香醛 缩合反应
%U http://lkxb.jxnu.edu.cn//oa/darticle.aspx?type=view&id=20130402