Phosphorus-containing hybrid calixphyrins: Promising mixed-donor ligands for visible and efficient palladium catalysts
Phosphorus-containing hybrid calixphyrins: Promising mixed-donor ligands for visible and efficient palladium catalysts
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DOI：
10.1021/ja0640039
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发表时间：
2006-09-13
影响因子：
15
通讯作者：
Sakaki, Shigeyoshi
中科院分区：
文献类型：
--
作者：
Matano, Yoshihiro;Miyajima, Tooru;Sakaki, Shigeyoshi
采用bf3催化，将σ4-2,5-二[（吡咯-2-基）甲基]磷孔与2,5-二[羟基（苯基）甲基]噻吩进行脱水缩合，制备了含磷-含硫杂化的卡菲啉。对Pd−P，N2， s杂化的萼卟啉配合物的x射线晶体分析表明，Pd中心被四个杂原子配位，呈扭曲的方形平面几何形状。Pd配合物在高温下高效催化溴芳烃与丙烯酸正丁酯的Heck反应，在溶液中呈现出特有的红紫色。
Phosphorus−sulfur-containing hybrid calixphyrins were prepared by the BF3-promoted dehydrative condensation between σ4-2,5-bis[(pyrrol-2-yl)methyl]phosphole and 2,5-bis[hydroxy(phenyl)methyl]thiophene. X-ray crystallographic analysis of the Pd−P,N2,S-hybrid calixphyrin complex revealed that the Pd center was coordinated by the four heteroatoms to adopt a distorted square planar geometry. The Pd complex, displaying a characteristic reddish purple color in solution, catalyzed the Heck reaction of bromoarenes withn-butyl acrylate with high efficiency at elevated temperatures.