Lewis acid catalyst system for Diels–Alder reaction
作者:Rishir Kalepu、Satyendra Mishra
DOI:10.1007/s12039-020-1749-8
日期:2020.12
catalytic system has been illustrated for the synthesis of Diels–Alder adduct for the first time. This procedure tolerates substrate diversity and delivers high yield. Use of environmentally benign catalyst, high yields and substrate diversity are the highlight of the existing method. Graphic Abstract Ca(OTf)2, along with n-Bu4NPF6 as the co-catalyst, is shown to be an effective Lewis acidic catalyst
摘要 Ca(OTf)2 / Bu 4 NPF 6催化体系首次被证明用于Diels-Alder加合物的合成。此过程可耐受底物多样性并提供高产量。使用环境友好的催化剂,高产率和底物多样性是现有方法的重点。 图形摘要 Ca(OTf)2和n- Bu 4 NPF 6作为助催化剂,被证明是一种有效的路易斯酸性催化剂体系,用于Diels-Alder反应。除了可持续和高效之外,此过程还很健壮,并且以接近定量的产量获得了产品。
Aqueous solutions that model the cytosol: studies on polarity, chemical reactivity and enzyme kineticsElectronic supplementary information (ESI) available: further results and discussion and tables of experimental data. See http://www.rsc.org/suppdata/ob/b4/b402886d/
作者:Nabil Asaad、Marie Jetta den Otter、Jan B. F. N. Engberts
DOI:10.1039/b402886d
日期:——
trends in polarity are mirrored in the effects of these solutes on chemical reactivity and enzyme kinetics. Environmental effects on the kinetics of hydrolysis of 4-nitrophenyl dichloroacetate, the hydronium-ion catalysed hydrolysis of 2-(4-nitrophenoxy)-tetrahydropyran, the acyltransferreaction between 4-nitrophenyl acetate and TRIS, the Diels-Alder reaction between 1,4-naphthoquinone and cyclopentadiene
An efficient and convenient method for the dehydrogenation and aromatization of various polycycles using o-iodoxybenzoic acid (IBX) is described.
本文介绍了一种利用邻碘氧基苯甲酸(IBX)对各种多环进行脱氢和芳香化的高效便捷方法。
Diels-Alder reactions in aqueous solutions. Enforced hydrophobic interactions between diene and dienophile
作者:Wilfried Blokzijl、Michael J. Blandamer、Jan B. F. N. Engberts
DOI:10.1021/ja00011a029
日期:1991.5
The intermolecular as well as the intramolecular Diels-Alderreaction are characterized by large rate accelerations upon going from an organic solvent to water as the reaction medium. A model for solvation effects on rate constants for Diels-Alderreactions in aqueous solutions is developed. The typical, huge rate enhancements for Diels-Alderreactions in water and in highly aqueous binary mixtures are
Specific acid catalysis and Lewis acid catalysis of Diels–Alder reactions in aqueous media
作者:Egid B. Mubofu、Jan B. F. N. Engberts
DOI:10.1002/poc.711
日期:2004.3
conditions, the reaction rate for 1a with 2 is about 40 times faster with copper catalysis than with specific acid catalysis. Moreover, at 32°C and 0.01 M HCl, the reaction of 1b with 2 is about 21 times faster than the same uncatalyzedreaction in purewater under the same reaction conditions. The inverse solvent kinetic isotope effect shows that these Diels–Alder reactions undergo specific acid catalysis