Abstract A green recyclable cellulose-supported Pd(salen)-type catalyst was synthesized through sequential three steps: chlorination with thionyl chloride, modification by ethylenediamine, and the formation of Schiff base with salicylaldehyde to immobilize palladium chloride through multiple binding sites. This novel heterogeneous cellulosic Pd(salen)-type catalytic complex was fully characterized by FT-IR, SEM, TEM, XPS, ICP-AES and TG. The traditional cross-coupling chemistry, such as Suzuki, Heck, Sonogashira, Buchwald–Hartwig amination and etherification, was then investigated in the presence of the above cellulose-palladium nanoparticle. Studies have shown that the synthesized catalyst shows high activity and efficiency for all types of transformations, providing the corresponding carbon–carbon or carbon–heteroatom coupling products in a general and mild manner. Furthermore, the catalyst demonstrates high to excellent yields and is easily recycled by simple filtration for up to twelve cycles without any significant loss of catalytic activity. Graphic Abstract

中文翻译：

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合成纤维素 Pd(salen) 型催化复合物作为交叉偶联反应的绿色可回收催化剂

摘要 通过亚硫酰氯氯化、乙二胺改性、水杨醛形成席夫碱通过多个结合位点固定氯化钯三个步骤，合成了一种绿色可回收的纤维素负载Pd(salen)型催化剂。这种新型多相纤维素 Pd(salen) 型催化复合物通过 FT-IR、SEM、TEM、XPS、ICP-AES 和 TG 进行了充分表征。然后在上述纤维素-钯纳米颗粒的存在下研究了传统的交叉偶联化学，如 Suzuki、Heck、Sonogashira、Buchwald-Hartwig 胺化和醚化。研究表明，合成的催化剂对所有类型的转化都表现出很高的活性和效率，以通用和温和的方式提供相应的碳-碳或碳-杂原子偶联产物。此外，该催化剂表现出高至极好的收率，并且可以通过简单的过滤轻松回收多达十二个循环，而不会显着降低催化活性。图形摘要