Lewis‐Pair‐Mediated Selective Dimerization and Polymerization of Lignocellulose‐Based β‐Angelica Lactone into Biofuel and Acrylic Bioplastic
作者:Xiao‐Jun Wang、Miao Hong
DOI:10.1002/anie.201913136
日期:2020.2.10
efficient dimerization and the first successful polymerization of lignocellulose-based β-angelica lactone (β-AL) by utilizing a selectiveLewispair (LP) catalytic system, thereby establishing a versatile bio-refinery platform wherein two products, including a dimer for high-quality gasoline-like biofuel (C8 -C9 branched alkanes, yield=87 %) and a heat- and solvent-resistant acrylicbioplastic (Mn up
该贡献报告说,利用选择性路易斯对(LP)催化系统,空前有效的二聚化和基于木质纤维素的β-当归内酯(β-AL)的首次成功聚合,从而建立了一种多功能的生物精炼平台,其中包括两种产品,包括可以从一种原料通过以下方法合成二聚体:一种用于高质量的类汽油生物燃料(C8 -C9支链烷烃,产率= 87%)和一种耐热和耐溶剂的丙烯酸类生物塑料(Mn最高为26.0 kg mol-1)。一个催化系统。从机理上探讨了LP催化体系对二聚和聚合反应精妙选择性的根本原因。
Stereoconvergent Conjugate Addition of Arylboronic Acids to α-Angelica Lactone Derivatives: Synthesis of Stereochemically Complex γ-Butyrolactones
作者:Jessica A. Griswold、Jeffrey S. Johnson
DOI:10.1021/acscatal.9b04405
日期:2019.12.6
with up to threecontiguousstereocenters. The reaction proceeds under a dynamic kineticresolution manifold by isomerizing the achiral starting material into an interconverting mixture of enantiomeric conjugate acceptors, followed by catalyst-controlled, enantiomer-selective 1,4-addition. Base-promoted racemization of the intermediate α,β-butenolide is possible due to the high kinetic and thermodynamic
A Pd-catalyzed enantioselective γ-selective arylation of β, γ-unsaturated butenolides is reported. The P-chiral phosphine ligand-AntPhos is essential for the observed high γ-selectivity, excellent enantioselectivity and good yields.
Upgrading lignocellulosic or carbohydrate material
申请人:Neste Oyj
公开号:US10988431B2
公开(公告)日:2021-04-27
The present disclosure relates to a method for upgrading lignocellulosic material carbohydrates and/or carbohydrate derivatives by dimerisation and/or oligomerisation using specific catalysts and to the use of the upgraded products.