Chain Multiplication of Fatty Acids to Precise Telechelic Polyethylene.
Chain Multiplication of Fatty Acids to Precise Telechelic Polyethylene.
复制标题
脂肪酸链倍增至精确遥爪聚乙烯。
作者：
Timo Witt;M. Häußler;S. Kulpa;S. Mecking
从常见的单不饱和脂肪酸开始，揭示了一种策略，其通过一系列两个可扩展的催化步骤提供超长脂肪族α，ω-双官能结构单元，所述催化步骤几乎使起始材料的链长加倍。在催化动态异构化结晶方法中，α，ω-二羧酸脂肪酸自复分解产物的中心双键选择性地移动到统计上非常不利的α，β-位置。通过随后的催化烯烃复分解步骤的“链倍增”，其通过使用废内烯烃作为可再循环的共试剂来克服该底物的低反应性，产生精确链长的超长链α，ω-双官能结构单元，如所证明的，直至C48链。这些结构的独特性质反映在由这些遥爪单体产生的脂肪族聚酯的无与伦比的熔点（Tm =120 °C）以及它们自组装成聚乙烯样单晶。
Starting from common monounsaturated fatty acids, a strategy is revealed that provides ultra-long aliphatic α,ω-difunctional building blocks by a sequence of two scalable catalytic steps that virtually double the chain length of the starting materials. The central double bond of the α,ω-dicarboxylic fatty acid self-metathesis products is shifted selectively to the statistically much-disfavored α,β-position in a catalytic dynamic isomerizing crystallization approach. "Chain doubling" by a subsequent catalytic olefin metathesis step, which overcomes the low reactivity of this substrates by using waste internal olefins as recyclable co-reagents, yields ultra-long-chain α,ω-difunctional building blocks of a precise chain length, as demonstrated up to a C48 chain. The unique nature of these structures is reflected by unrivaled melting points (Tm =120 °C) of aliphatic polyesters generated from these telechelic monomers, and by their self-assembly to polyethylene-like single crystals.
影响因子：
5.5
作者：
O'Connor, Kyle S.;Watts, Annabelle;Coates, Geoffrey W.
通讯作者：
Coates, Geoffrey W.