Solvent-driven isomerization of <i>cis</i>,<i>cis</i>-muconic acid for the production of specialty and performance-advantaged cyclic biobased monomers
作者:Jack M. Carraher、Prerana Carter、Radhika G. Rao、Michael J. Forrester、Toni Pfennig、Brent H. Shanks、Eric W. Cochran、Jean-Philippe Tessonnier
DOI:10.1039/d0gc02108c
日期:——
with novel compounds. Muconic acid (MA) has recently been identified as a bioprivileged intermediate as it gives access to valuable aliphatic and cyclic diacid monomers including terephthalic acid (TPA), 1,4-cyclohexanedicarboxylic acid (CHDA), and novel monounsaturated 1,4-cyclohexenedicarboxylic acids (CH1DA, CH2DA). However, accessing these cyclic monomers from MA requires to first isomerize biologically-produced
对绿色塑料的追求要求使用生物质作为原料的新途径来生产芳族单体。通过逆合成分析已经确定了几种商品芳烃的合适原料分子和转化途径。然而,这种方法由于一次靶向单个分子而受到一些限制。更具影响力的方法是针对生物特权分子,这些分子是一系列商品和特种化学品以及新型化合物的中间产物。粘康酸(MA)最近被鉴定为生物特权中间体,因为它可以获取有价值的脂族和环状二酸单体,包括对苯二甲酸(TPA),1,4-环己烷二羧酸(CHDA)和新型单不饱和1,4-环己二羧酸(CH1DA,CH2DA)。然而,顺式,顺式-MA转化为Diels-Alder活性反式,反式-MA。这种异构化的主要障碍是MA产生内酯的不可逆闭环。在本文中,我们证明了使用二甲基亚砜和水的绿色溶剂介导的异构化。在此获得的机理理解阐明了低浓度水在降低系统酸度中的作用,从而防止了内酯的形成并将反式,反式-MA的选择性从不到5%提高到超过85%。最后,与反式,反