Salicylaldiminate (SalAld)-ligated Pd complexes were generated by the reaction of SalAld with Pd(tfa)₂ in THF, and their initiating ability for C1 polymerization of diazoacetate was investigated. When a mixture of a series of SalAlds and Pd(tfa)₂ ([SalAld]/[Pd(tfa)₂] = 2 : 1–4 : 1) was employed for the polymerization of ethyl diazoacetate (EDA), polyEDA’ with a high number-average molar mass (M_n,_SEC = 20000–35 000) was obtained in moderate yield; the polymer yield became highest (50%) when the polymerization was conducted with a [SalAld]/[Pd(tfa)₂] ratio of 4 : 1 at 50 °C for 13 h. NMR analyses indicated that polyEDA’ had a syndiotactic-rich main chain stereo-structure. These results demonstrate that the SalAld/Pd(tfa)₂ system is a new effective initiating system for the C1 polymerization of diazoacetate, which can be generated from a combination of ordinary reagents with facile procedures.

中文翻译：

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用于重氮乙酸酯 C1 聚合的水杨醛二酸酯/Pd(三氟乙酸)2 [SalAld/Pd(tfa)2]引发系统：通过简单的程序从普通试剂生成活性引发剂

_{通过 SalAld 与 Pd(tfa) 2}在 THF 中反应生成水杨醛二酸酯 (SalAld) 连接的 Pd 配合物，并研究了它们对重氮乙酸酯 C1 聚合的引发能力。当一系列 SalAlds 和 Pd(tfa) ₂的混合物（[SalAld]/[Pd(tfa) ₂ ] = 2 : 1–4 : 1）用于重氮乙酸乙酯（EDA）的聚合时，聚EDA'以中等产_率获得高数均摩尔质量（Mn，_{SEC = 20000–35 000）；当[SalAld]/[Pd(tfa) 2} ]比例为4:1、50℃聚合13小时时，聚合物产率最高(50%) 。 NMR分析表明polyEDA'具有富含间同立构的主链立体结构。这些结果表明，SalAld/Pd(tfa) ₂体系是重氮乙酸C1聚合的一种新型有效引发体系，可以通过普通试剂的组合和简便的程序来产生。