Oxime carbapalladacycle covalently anchored to high surface area inorganic supports or polymers as heterogeneous green catalysts for the Suzuki reaction in water.
Oxime carbapalladacycle covalently anchored to high surface area inorganic supports or polymers as heterogeneous green catalysts for the Suzuki reaction in water.
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DOI：
10.1002/chin.200425104
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发表时间：
2004-01
期刊：
影响因子：
--
通讯作者：
C. Baleizão;A. Corma;H. García;A. Leyva
中科院分区：
文献类型：
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作者：
C. Baleizão;A. Corma;H. García;A. Leyva
肟卡帕拉环被认为是一种用于水中 Suzuki 偶联的活性极高的均相催化剂，已被方便地改性并固定在高表面积 SiO(2)、MCM-41 和聚苯乙烯-二乙烯基苯和乙二醇二甲基丙烯酸酯聚合物上。所得固体通过分析和光谱（紫外-可见和红外）技术进行表征，并作为 4-氯苯乙酮与苯基硼酸在水、二恶烷和两者的混合物中反应的催化剂进行测试。取决于载体的活性差异是显着的，当负载在 SiO(2) 或 MCM-41 上时，钯络合物对于水中的反应更加活跃。该催化剂是真正的非均相催化剂（没有浸出钯），当锚定在 SiO(2) 上时，可以重复使用七次而不会失去活性。锚定在 SiO(2) 中的钯络合物也作为 Suzuki 催化剂进行了测试，适用于各种溴代、氯代甚至氟代芳香族化合物。
An oxime carbapalladacycle known as an extremely active homogeneous catalyst for the Suzuki coupling in water has been conveniently modified and anchored on high surface area SiO(2), MCM-41, and polystyrene-divinylbenzene and ethylenglycol dimethylacrylate polymers. The resulting solids were characterized by analytical and spectroscopic (UV-vis and IR) techniques and tested as catalysts for the reaction of 4-chloroacetophenone with phenylboronic acid in water, dioxane, and a mixture of both. Differences in activity depending on the support were remarkable, the palladium complex being more active for the reactions in water when supported on SiO(2) or MCM-41. The catalysts were truly heterogeneous (no leached palladium) and when anchored on SiO(2) were reused seven times without loosing activity. Palladium complex anchored in SiO(2) was also tested as Suzuki catalyst for a wide range of bromo-, chloro-, and even fluoroaromatics.