Catalytic O-methylation of phenols with dimethyl carbonate to aryl methyl ethers using [BMIm]Cl

Selective O-methylation of phenols and benzyl alcohols in simple pyridinium based ionic liquids

“…Over the years many new methods have been reported for the synthesis of arylalkylethers. Although these methods are effective most of these approaches suffer from drawbacks such as utilization of expensive metal catalysts and hindered electron rich phosphine ligands [26][27][28][29]. The need for more environmentally acceptable processes has fuelled great interest towards dialkylcarbonates as alkylating agents.…”

Study on Selective Dimerization of α-Methylstyrenes Promoted by Ionic Liquids

“…As a part of our interest in performing organic reactions in ionic liquids [19,20], we report herein that ionic liquids containing BF 4 -anion act as powerful media in the HBF 4 -catalyzed dimerization of a-methylstyrene. The experimental results showed that these ionic liquids played important roles not only for accelerating the reaction but for improving the product selectivities.…”

Layered Double Hydroxide‐Supported L‐Methionine‐Catalyzed Chemoselective O‐Methylation of Phenols and Esterification of Carboxylic Acids with Dimethyl Carbonate: A “Green” Protocol

“…Phenols with electron-donating groups and/bulky substituents retard O-methylation (Table 2, entries 11-13). [47] This O-methylation protocol is also found to be suitable for ketones having hydroxyl groups ( To generalize this method further, S-and N-methylation are also carried out under identical conditions. S-Methylation is very efficient giving 97 % yield with very little amount of diphenyl disulfide as byproduct.…”

“…[46] As the ionic liquid, [BMIm]Cl is used for O-methylation of phenol selectively to anisole and the percentage conversion mainly depends on the imidazolium moiety of the ionic liquid. [47] Phenol is O-methylated by a continuous-flow method which requires poly(ethyleneglycol) 1000 as an anion activator along with K 2 CO 3 . [48] Fluorine-modified Mg-Al mixed oxides have been used for O-methylation of phenol and the percentage conversion depends on F/Mg ratio.…”