Articles written in Journal of Chemical Sciences
Volume 123 Issue 5 September 2011 pp 623-630
The Prins cyclization of homoallyl alcohol with a variety of aldehydes were observed under reflux condition in dichloromethane using both polyaniline supported TsOH (PANI-TsOH) and FeCl3 (PANI- FeCl3) as reusable acid catalysts with the formation of 2,4-disubstituted tetrahydropyran ether as single product. In case of $4-$, $3-$ and $2-$ nitro benzaldehydes, the reaction generated acetal of the aldehyde and homoallylic alcohol as single product. Additionally, both catalysts were investigated for the synthesis of 1, 3-dioxane in dichloromethane under reflux and at ambient temperature.
Volume 126 Issue 6 November 2014 pp 1629-1634 Rapid Communications
This study investigated the existence of keto-enol tautomers for the first time during the synthesis of aryl-bis(2-hydroxy-1-naphthyl)methane from 2-naphthol and 𝑝-tolualdehyde or 4-chlorobenzaldehyde in methanol using CuSO4.5H2O as catalyst under reflux condition. The exclusive formation of aryl-bis(2-hydroxy-1-naphthyl)methaneswas observed in dichloromethane at room temperature in the presence of BF3.OEt2/AcOH as catalyst. The keto productswere isolated and characterized by 1HNMR, 13C NMR, COSY and DEPTspectra.
Volume 130 Issue 12 December 2018 Article ID 0170
Eight new members of two series of PEG-6000-bridged geminal dicationic ionic liquids based on diphenylammonium/imidazolium cation were synthesized by the change of four anions CF3COO-, CCl3COO-,AcO- and HSO -4. They were investigated as reusable acidic catalysts for dehydration of fructose to 5-hydroxymethylfurfural in polar aprotic solvent. The characterizations of dicationic ionic liquids were done using 1H NMR, 13C NMR, IR and TGA analyses. Irrespective of Hammett acidity strength of the eight ILs, they displayed single peak selectivity for the 5-hydroxymethyl furfural intermediate in HPLC analysis.
Volume 132, 2019
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