STRONGLY LEWIS ACIDIC METAL-ORGANIC FRAMEWORKS FOR CONTINUOUS FLOW CATALYSIS
申请人:The University of Chicago
公开号:US20210053042A1
公开(公告)日:2021-02-25
Lewis acidic metal-organic framework (MOF) materials comprising triflate-coordinated metal nodes are described. The materials can be used as heterogenous catalysts in a wide range of organic group transformations, including Diels-Alder reactions, epoxide-ring opening reactions, Friedel-Crafts acylation reactions and alkene hydroalkoxylation reactions. The MOFs can also be prepared with metallated organic bridging ligands to provide heterogenous catalysts for tandem reactions and/or prepared as composites with support particles for use in columns of continuous flow reactor systems. Methods of preparing and using the MOF materials and their composites are also described.
PREPARATION AND USE OF CHIRAL ZEOLITES FOR LIQUID CHROMATOGRAPHY
申请人:Refaei Mohd
公开号:US20100089831A1
公开(公告)日:2010-04-15
The present invention relates to the preparation of chiral zeolites and their use in liquid chromatography. The zeolite material may be used in the chromatographic separation of mixtures of components, such as the separation of enantiomers.
Metal Node Control of Brønsted Acidity in Heterobimetallic Titanium–Organic Frameworks
作者:Ana Rubio-Gaspar、Sergio Navalón、Sergio Tatay、Francisco G. Cirujano、Carmen Fernández-Conde、Natalia M. Padial、Carlos Martí-Gastaldo
DOI:10.1021/jacs.2c12718
日期:——
grafting of strong acids, which here originate from the combination of Lewis Ti4+ and Brønsted Fe3+–OH acid sites. The applicability of MUV-101(Fe) to the synthesis of β-aminoalcohols is demonstrated with a scope that also includes the gram scale synthesis of propranolol, a natural β-blocker listed as an essential medicine by the World Health Organization, with excellent yield and selectivity.
与间接骨架修饰相比,簇组成的合成控制可用于直接获得催化活性,排除特定金属组合。我们通过使用同金属和异双金属金属氧三聚体(Fe 3 、 Ti 3 、 TiFe 2 、 TiCo 2和 TiNi 2 )的五种组合的同结构介孔框架测试环氧化物的氨解来证明这一概念。只有 TiFe 2节点表现出与基于强酸接枝的基准催化剂相当的活性,强酸接枝源自 Lewis Ti 4+和 Brønsted Fe 3+ -OH 酸位点的组合。论证了MUV-101(Fe)在β-氨基醇合成中的适用性,范围还包括克级合成普萘洛尔,一种被世界卫生组织列为基本药物的天然β-受体阻滞剂,具有优异的合成效果。产率和选择性。
Aluminium triflate: an efficient recyclable Lewis acid catalyst for the aminolysis of epoxides
作者:D. Bradley G. Williams、Michelle Lawton
DOI:10.1016/j.tetlet.2006.07.036
日期:2006.9
Epoxides are powerful starting materials for a range of useful materials and can be converted into, amongst others, amino alcohols. In this work, a range of epoxides was ring-opened using various alkyl- and arylamines under the action of aluminium triflate as a catalyst. This catalyst was found to be highly active, producing the desired amino alcohol products in high yields with low catalyst loadings. Additionally, it was shown that the aluminium triflate catalyst is recyclable by simple extraction into water and may be re-used several times. (c) 2006 Elsevier Ltd. All rights reserved.