4907-37-3Relevant academic research and scientific papers
Direct esterification of carboxylic acids with p-cresol catalysed by acid activated Indian bentonite
Vijayakumar,Iyengar, Pushpa,Nagendrappa, Gopalpur,Prakash, B.S. Jai
, p. 1950 - 1953 (2007/10/03)
Acid activated Indian bentonite (AAIB) catalyst is used for the first time to esterify various carboxylic acids with p-cresol in average to excellent yields. Optimisation studies have been carried out for p-cresyl stearate synthesis. The catalyst is recoverable and recyclable.
Lipase catalyzed esterification of cresols
Suresh Babu,Karanth,Divakar
, p. 1068 - 1071 (2007/10/03)
Esters of m- and p-cresols with organic acids having carbon chain lengths C2-C18 have been prepared by using lipases from porcine pancreas and Rhizomucor miehei. Gram level conversions are carried out under non-solvent conditions in case of shake flask experiments and continuous removal of water at bench-scale levels. Addition of 0.1 mL of 0.1M phosphate buffer at pH 7.0 to the reaction mixture shows better conversions. Optimization studies have been carried out for p-cresyl laurate synthesis using Rhizomucor miehei lipase which show a maximum conversion of 74.4 %. Better conversions are obtained with larger amounts of enzyme. Porcine pancreas lipase catalyzed synthesis of m- and p-cresyl esters show that under identical reaction conditions acids with lower carbon chain lengths (C2-C4) give ester yields above 30%, while those with longer carbon chain lengths give ester yields 30%.
the Effect of Hydrophobic-Lipophilic Interactions on Chemical Reactivity. 1. New Evidence for Intermolecular Aggregation and Self-Coiling
Jiang, Xi-Kui,Hui, Yong-Zheng,Fan, Wei-Qiang
, p. 3839 - 3843 (2007/10/02)
The hydrolytic behavior of 21 para-substituted phenyl esters of n-alkanoic acids (n-X) with various chain lengths in 60:40 (Φ=0.60), 50:50 (Φ=0.50), and 40:60 v/v (Φ=0.40) Me2SO-H2O mixtures was studied.Four new sets of experimental results which include departure from Hammett correlation for N-hexadecanoates (16-X), substantial differences in activation parameters, and effects of amylose on the kinetic parameters and on the activation parameters are presented along lines of reasoning mentioned by previous authors.These data establish that the aggregation and self-coiling of the n-alkanoate chain actually exist under experimental conditions.
