Controlled photocycloaddition of unsaturated carboxylates intercalated in hydrotalcite clay interlayers
Controlled photocycloaddition of unsaturated carboxylates intercalated in hydrotalcite clay interlayers
复制标题
水滑石粘土夹层中不饱和羧酸盐的受控光环加成
DOI：
10.1021/ja00063a060
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发表时间：
1993
影响因子：
15
通讯作者：
Y. Sawaki
中科院分区：
文献类型：
--
作者：
K. Takagi;T. Shichi;H. Usami;Y. Sawaki
在水滑石粘土存在下，研究了几种不饱和羧酸盐的光化学环加成反应。在分散粘土中插入肉桂酸钠的辐射作用下，选择性地形成了SYN头对头的环状二聚体。另一方面，以(苯乙基)苯甲酸酯为例，合成了两种异构体：头对头环二聚体和头对尾二聚体。插层程度取决于羧酸盐的结构。W-射线衍射仪分析表明，由于粘土夹层具有上下两个离子表面，因此羧酸盐以单分子层的形式插层，这表明粘土夹层为反平行堆积
Photochemical cycloaddition for several unsaturated carboxylates has been studied in the presence fo hydrotalcite clays. Syn head-to-head cyclodimers were selectively formed in the irradiation of sodium cinnamates intercalated in the dispersed clays. On the other hand, two isomers of syn head-to-head and syn head-to-tail cyclodimers were formed for the case of (phenylethyl)benzoates. The degree fo intercalation was shown to be dependent on teh structures of the carboxylates. W-ray diffraction analyses revealed that the carboxylates are intercalated as monolayer, which suggests and alternatte anti-parallel packing since a clay interlayer possesses two ionic surfaces, top and bottom