Hydrazine-Catalysed Ring-Opening Metathesis Polymerization Of Cyclobutenes

IF 16.1 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Angewandte Chemie International Edition Pub Date : 2024-08-26 DOI:10.1002/anie.202413093
Julian S. Kellner-Rogers, Jesse H. Hsu, Dr. Ivan Keresztes, Prof. Dr. Brett P. Fors, Prof. Dr. Tristan H. Lambert
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Abstract

Materials formed by the ring-opening metathesis polymerization (ROMP) of cyclic olefins are highly valued for industrial and academic applications but are difficult to prepare free of metal contaminants. Here we describe a highly efficient metal-free ROMP of cyclobutenes using hydrazine catalysis. Reactions can be initiated via in situ condensation of a [2.2.2]-bicyclic hydrazine catalyst with an aliphatic or aromatic aldehyde initiator. The polymerizations show living characteristics, achieving excellent control over molecular weight, low dispersity values, and high chain-end fidelity. Additionally, the hydrazine can be used in substoichiometric amounts relative to the aldehyde chain-end while maintaining good control over molecular weight and low dispersity values, indicating that a highly efficient chain transfer mechanism is occurring.

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肼催化的环丁烯开环 Metathesis 聚合反应。
环烯烃开环偏聚(ROMP)形成的材料在工业和学术应用中具有很高的价值,但很难制备出不含金属污染物的材料。在此,我们介绍了一种使用肼催化的高效无金属环丁烯 ROMP。通过[2.2.2]双环肼催化剂与脂肪族或芳香族醛引发剂的原位缩合,可以引发反应。聚合反应显示出活的特性,可实现出色的分子量控制、低分散值和高链端保真度。此外,相对于醛链端,肼的用量可以达到亚几何量,同时还能保持对分子量的良好控制和较低的分散度值,这表明发生了高效的链转移机制。
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来源期刊
CiteScore
26.60
自引率
6.60%
发文量
3549
审稿时长
1.5 months
期刊介绍: Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.
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