Polymeric microsphere-loaded palladium-iminodiacetic acid complex as an efficient and easily recycled catalyst for Suzuki reaction in ionic liquid

Polymeric microsphere-loaded palladium-iminodiacetic acid complex as an efficient and easily recycled catalyst for Suzuki reaction in ionic liquid
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负载聚合物微球的钯-亚氨基二乙酸络合物作为离子液体中铃木反应的高效且易于回收的催化剂

DOI:
10.1007/s11164-019-03738-y
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发表时间:
2019-01
影响因子:
3.3
通讯作者:
Wu Songhua
Wu Songhua
中科院分区:
化学3区
文献类型:
--
作者:
Zhang Jianzheng;Chen Jingshuai;Zhang Qiuyu;Wang Rumin;Wu Songhua

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采用一步无皂乳液聚合法合成了核富含PS、壳富含PMAA的苯乙烯-甲基丙烯酸共聚物(PS-co-PMAA)核交联壳核微球。 PS-co-PMAA微球的壳上负载有钯(Pd)-亚氨基二乙酸(IDA)络合物催化剂,具有高分散度的优点,因此具有高活性。然后将所得聚合物微球催化剂体系应用于催化芳基卤化物与苯基硼酸在1-丁基-3-甲基咪唑鎓四氟硼酸盐([bmim][BF4])离子液体中的Suzuki反应。我们的催化剂系统被证明对芳基溴和芳基碘均有效且具有活性。与传统的 Pd(Ph3)4 催化剂相比,本文使用的 PS-co-PMAA-IDA-Pd 催化剂在更低的催化剂浓度下提供了更高的 Suzuki 反应产率。此外,我们的基于聚合物微球的催化系统可以轻松回收至少四次,在离子[bmim][BF4]液体中具有高活性。
Core-crosslinked shelled-core microspheres of poly(styrene-co-methyl acrylic acid) (PS-co-PMAA), with cores rich in PS and the shell rich in PMAA, were synthesized by one-stage soap-free emulsion polymerization. A palladium (Pd)-iminodiacetic acid (IDA) complex catalyst is loaded on the shell of the PS-co-PMAA microsphere, which results in the advantage of high dispersion degree and, therefore, high activity. The resultant polymeric microspheres catalyst systems are then applied to catalyze the Suzuki reaction of aryl halides with phenylboronic acid in an ionic liquid of 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]). Our catalyst systems are proved to be efficient and active for both aryl bromides and aryl iodides. Compared to traditional Pd(Ph3)4catalyst, the PS-co-PMAA-IDA-Pd catalyst used here affords higher yield of Suzuki reaction at even lower catalyst concentration. In addition, our polymeric-microsphere based catalytic system can be easily recycled at least four times with high activity in ionic [bmim][BF4] liquid.
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