Web21. jul 2024. · The catalytic effect of various weakly interacting Lewis acids (LAs) across the periodic table, based on hydrogen (Group 1), pnictogen (Group 15), chalcogen (Group 16), and halogen (Group 17) bonds, on the Diels-Alder cycloaddition reaction between 1,3-butadiene and methyl acrylate was studied quantum chemically by using relativistic … Web08. jan 2001. · Among the organic reactions investigated in aqueous medium, the Diels−Alder cycloaddition has been the most widely studied because of its great importance in the synthetic and theoretical fields. The Diels−Alder reaction is greatly enhanced by Lewis acid catalysis, and this review illustrates recent significant results in this field …

Asymmetric Lewis acid organocatalysis of the Diels–Alder reaction …

Web29. maj 2024. · The effects of metal-based Lewis acid (LA) catalysts on the reaction rate and regioselectivity in polar Diels–Alder (P-DA) reactions has been analyzed within the … Web08. feb 2024. · An asymmetric FeIII-bipyridine diol catalyzed Diels–Alder reaction of α,β-unsaturated oxazolidin-2-ones has been developed. Among various FeII/FeIII salts, … headstone decorations for grandparents

E. Peter Kündig – University of Geneva – Genf, Genf, Schweiz

WebThe Diels–Alder cycloaddition of dienophile 86 and diene 134 was successfully performed in the presence of BH 3 ·THF as a Lewis acid catalyst to enhance the reactivity of 2′ … WebThe importance of the asymmetric Lewis acid-catalyzed Diels-Alder and hetero-Diels Alder reactions in organic synthesis has been emphasized in a number of recent reviews.2 Moreover, Lewis acids are frequently effective in promoting selectivity in other processes, such as the ene,3 WebThis strategy employs a Diels–Alder cycloaddition to assemble a fused bicyclic anhydride intermediate, which is elaborated to a vinyl lactone-acetal bearing an aromatic ring in five steps. ... while carboxylic acids can be … headstone design app