Lanthanide(III) nitrobenzenesulfonates and p-toluenesulfonate complexes of lanthanide(III), iron(III), and copper(II) as novel catalysts for the formation of calix[4]resorcinarene
作者:Karen Deleersnyder、Hasan Mehdi、István T. Horváth、Koen Binnemans、Tatjana N. Parac-Vogt
DOI:10.1016/j.tet.2007.06.090
日期:2007.9
catalysts for the synthesis of resorcinol-derived calix[4]resorcinarenes. The reaction of resorcinol with benzaldehyde yields two isomers, the all-cis isomer (rccc) and the cis-trans-trans isomer (rctt) with the relative isomer ratios depending on the reaction conditions. However, in the reaction of resorcinol with octanal only one isomer, the all-cis isomer, is formed in highyields with less than 0
Bismuth compounds in organic synthesis. Synthesis of resorcinarenes using bismuth triflate
作者:Katherine E Peterson、Russell C Smith、Ram S Mohan
DOI:10.1016/j.tetlet.2003.08.093
日期:2003.10
Bismuth triflate (5 mol%) smoothly catalyzes the condensation of aromatic and aliphatic aldehydes with resorcinol to give tetrameric cyclic products, resorcinarenes. With benzaldehyde, the product is obtained as a mixture of two diastereomers and the ratio of the diastereomers depends on reaction time. On the other hand, a single diastereomer is obtained with aliphatic aldehydes. The low toxicity and
Molecular iodine: An efficient and environment-friendly catalyst for the synthesis of calix[4]resorcinarenes
作者:Fatemeh Darvish、Shima Khazraee
DOI:10.1016/j.crci.2013.10.017
日期:2014.9
Abstract Iodine catalyzes the cyclocondensation of various aldehydes with resorcinol to give tetrameric cyclic products, resorcinarenes. Through the reaction of resorcinol with aromatic aldehydes, the product is obtained as a mixture of two isomers, the all- cis isomer (rccc) and the cis - trans - trans isomer (rctt), whereas a single diastereomer, the all- cis , is formed with aliphaticaldehydes. Besides
In this work, for the first time, metal hydrogen phosphates and sulfates have been studied as effective solid acid catalysts for the condensation of resorcinol with aromatic and aliphatic aldehydes to give tetrameric cyclic products, resorcinarenes, which have major roles in biological and industrial activities. This catalyst has several advantages, it is non-toxic, thermally and mechanically stable, inexpensive and highly resistant against organic solvents. It increases the reaction rate about six fold and makes this method an attractive alternative to the existing methods for resorcinarene formation. Interestingly, the present catalyst exhibited a high turnover number (TON) and turnover frequency (TOF) which were even comparable with that of HCl.[GRAPHICS].