Alkylation of p-cresol with tert-butyl alcohol using benign Bronsted acidic ionic liquid catalyst

Mechanistic insights into solvent induced alkylation of p-cresol with tert-butyl alcohol using Brönsted acidic ionic liquids

“…Among these ILs, IL-CF 3 SO 3 proved to be the most efficient in terms of the p-cresol conversion of 86.2%. IL-HSO 4 was more selective towards the ortho alkylated product, 2-TBC, with a maximum value of 86.6% as also reported in prior art [14]. In contrary, IL-CH 3 SO 3 proved to be less selective and a mixture of O-alkylated and C-alkylated products were obtained.…”

“…Triethylamine based Bronsted acidic ILs have been reported earlier to be highly efficient catalysts for this alkylation reaction [14]. In this present study, p-cresol was considered as a model aromatic compound and tert-butyl alcohol as a model alkylating agent, to investigate the effect of ILs on this type of alkyla-…”

“…The cation-exchange resins are not thermally stable enough to be used industrially. Recently, several researchers reported Bronsted acidic IL catalysts under homogeneous phase mild reaction conditions in batch reactor process yielding more than 80% of p-cresol conversion [13][14][15]. With negligible vapor pressure, ease of separation, excellent thermal stability and almost complete recoverability, room temperature ILs seem to be attractive solution for most of these acid catalyzed alkylation reactions [16][17][18][19][20][21][22][23].…”

Structural Effects on the Physico‐Chemical and Catalytic Properties of Acidic Ionic Liquids: An Overview

“…[120] Brønsted acidic ILs with SO 3 H functionalities and protic anions, in particular [HSO 4 ] -, prepared from N-methylimidazole, pyridine, and triethylamine, have recently been tested [121] by Upadhyayula et al in tert-butylation of p-cresol with tert-butyl alcohol. The effects of several parameters (time, temperature, reactant molar ratio, and catalyst recyclability) on the conversion of p-cresol and selectivity for 2-tert-butyl-p-cresol (TBC) or for 2,6-di-tert-butyl-p-cresol (DTBC) were investigated.…”

Synthesis of hydroxymethylfurfural from sucrose using brönsted-lewis acidic ionic liquid

“…As a kind of environmental-friendly catalysts, Brönsted or Lewis acidic ionic liquids (ILs) get attentions of researchers [9], and many organic reactions, such as transesterification [10], alkylation [11], polymerization [12] and carbonylation [13] were reported with excellent selectivity, and the used ILs were of outstanding recyclability. Studies involving the utilization of ILs as reaction media or as catalysts for the reaction of biomass sugar to HMF have also been reported.…”