Polyketo-enols and chelates. Part I. The formation and constitution of xanthophanic enol and the xanthyrones
作者:L. Crombie、D. E. Games、M. H. Knight
DOI:10.1039/j39670000757
日期:——
A new structure is proposed, on the basis of spectroscopic and chemical evidence, for the yellow compound diethyl xanthophanicenol formed when ethyl sodioacetoacetate and ethyl ethoxymethyleneacetoacetate are heated together. A mechanism of formation is outlined and supported. The new information is used to prepare various compounds of the xanthyrone class and two of these, 3,3′,3′,5-tetra-acetyl
Synthesis of substituted phenols via 1,1-dichloro-2-nitroethene promoted condensation of carbonyl compounds with DMF
作者:Fukai Wang、Wei Wu、Xiaoyong Xu、Xusheng Shao、Zhong Li
DOI:10.1016/j.tetlet.2018.04.076
日期:2018.6
A novel and efficient metal-free synthesis of phenoliccompounds was developed via coupling cyclization of DMF as a carbon source with active methylene compounds such as 1,3-dicarbonyl compounds with the assistance of 1,1-dichloro-2-nitroethene. The method we used was different from other traditional phenol functionalization methods. In the reaction, the 1,1-dichloro-2-nitroethene as a promoter which
One‐Step Reaction of Friedel–Crafts Acylation and Demethylation of Aryl‐Methyl Ethers Catalyzed by Ytterbium(III) Triflate
作者:Weike Su、Can Jin
DOI:10.1081/scc-200036628
日期:2004.12.31
Abstract Catalytic amount of ytterbium(III) triflate [Yb(OTf)3] has been used to catalyze Friedel–Craftsacylation and demethylation of aryl‐methyl ethers in one‐step reaction to produce hydroxyacylphenones with moderate yields under mild conditions.
The use of carbon dioxide as a renewable and environmentally friendly source of carbon is highly attractive. A novel and efficient protocol for the synthesis of phenolic compounds from carbonyl compounds and carbon dioxide in the presence of a catalytic amount of Pd(OAc)2 has been developed. This reaction is appealing for industries and is a tool for the sequestration of carbon dioxide.
Copper-catalyzed synthesis of phenolic compounds with DMSO as the methylene source
作者:Run Luo、Lina Guo、Wenjie Liu、Shaohua Wang
DOI:10.1080/00397911.2021.1902536
日期:——
application of DMSO as an ideal source of carbon is highly attractive. A simple and novel protocol has been developed for the synthesis of phenoliccompounds via CuSO4·5H2O-catalyzed cyclization of 1,3-dicarbonyl compounds with DMSO. It was found that the unsymmetrical 1,3-dicarbonyl compounds always gave a mixture of two isomeric products. In addition, the deuterium-labeling experiments revealed that the C2