Size-selective catalysis of ester and anilide cleavage by the dinuclear barium(II) complexes of cis- and trans-stilbenobis(18-crown-6).
Size-selective catalysis of ester and anilide cleavage by the dinuclear barium(II) complexes of cis- and trans-stilbenobis(18-crown-6).
复制标题
顺式和反式二苯乙烯双(18-crown-6)双核钡(II)配合物对酯和苯胺裂解的尺寸选择性催化。
DOI：
10.1021/jo016149q
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
L. Mandolini
中科院分区：
文献类型：
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作者：
R. Cacciapaglia;S. Di Stefano;L. Mandolini
顺式和反式芪双（18-冠-6）的双核Ba（II）配合物催化的酯和苯胺的碱性乙醇分解，赋予远端羧酸锚定基团。与单核模型催化剂的催化效率的比较表明，双核配合物中的两个金属离子协同作用。催化剂的顺式形式比反式形式更有效，并且对基底的尺寸更敏感，表明由顺式双键施加的凹形形状更适合于催化。还报道了活性较低的反式在原位被光活化的实验。
The basic ethanolysis of esters and anilides endowed with a distal carboxylate anchoring group is catalyzed by the dinuclear Ba(II) complexes of cis- and trans-stilbenobis(18-crown-6). Comparison with the catalytic efficiency of a mononuclear model catalyst demonstrates that the two metal ions in the dinuclear complexes act synergically. The cis form of the catalyst is more efficient than the trans form and much more sensitive to the size of the substrate, showing that the concave shape imposed by the cis double bond is better suited for catalysis. An experiment in which the less active trans form is photoactivated in situ is also reported.