Carboxylic acids 1a and 1b bearing three poly(ethylene glycol) (PEG) chains and carboxylic acid 1c bearing one PEG chain were designed and synthesized. The carboxylic acids 1a–c were fully characterized by NMR and ESI-HRMS analyses. In a Pd-catalyzed aerobic oxidation of 1-phenylethanol, 1a and 1b worked well as carboxylate ligands.

中文翻译：

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带有聚乙二醇链的羧酸的合成与表征

设计并合成了带有三个聚乙二醇 (PEG) 链的羧酸 1a 和 1b 和带有一个 PEG 链的羧酸 1c。通过 NMR 和 ESI-HRMS 分析对羧酸 1a-c 进行了充分表征。在 Pd 催化的 1-苯基乙醇有氧氧化中，1a 和 1b 作为羧酸盐配体效果很好。