The field of supported catalysis has experienced increased attention with respect to the development of novel architectures for immobilizing catalytic species, aiming to maintain or enhance their activity while facilitating the easy recovery and reuse of the active moiety. Dendrimers have been identified as promising candidates capable of imparting such properties to catalysts through selective functionalization. The present study details the synthesis of two polyphosphorhydrazone (PPH) dendrons, each incorporating azide or acetylene groups at the core for subsequent coupling through “click” triazole chemistry. Employing this methodology, a novel PPH Janus dendrimer was successfully synthesized, featuring ten polyethylene glycol (PEG) chains on one side of the structure and ten Ru(p-cymene) derivatives on the other. This design was intended to confer dual properties, influencing solubility modulation, and allowing the presence of active catalytic moieties. The synthesized dendrimer underwent testing in the isomerization of allyl alcohols in organic solvents and biphasic solvent mixtures. The results demonstrated a positive dendritic effect compared with model monometallic and bimetallic species, providing a proof-of-concept for the first PPH Janus dendrimer with tested applications in catalysis.

中文翻译：

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通过“点击”化学构建的水溶性聚磷腙 Janus 树枝状聚合物作为催化中 Ru 配合物的支持

负载催化领域越来越关注用于固定催化物质的新型结构的开发，旨在维持或增强其活性，同时促进活性部分的轻松回收和再利用。树枝状聚合物已被认为是有希望的候选者，能够通过选择性官能化赋予催化剂此类性质。本研究详细介绍了两种聚磷腙 (PPH) 树枝的合成，每个树枝均在核心包含叠氮或乙炔基团，以便随后通过“点击”三唑化学进行偶联。采用这种方法，成功合成了一种新型 PPH Janus 树枝状聚合物，其结构一侧有 10 条聚乙二醇 (PEG) 链，另一侧有10 条 Ru( p-伞花烃) 衍生物。该设计旨在赋予双重特性，影响溶解度调节，并允许活性催化部分的存在。合成的树枝状聚合物在有机溶剂和双相溶剂混合物中进行了烯丙醇异构化测试。结果表明，与模型单金属和双金属物质相比，具有积极的树枝状效应，为第一个经过测试的催化应用的 PPH Janus 树枝状聚合物提供了概念验证。