A Sulfone‐Containing Imidazolium‐Based Brønsted Acid Ionic Liquid Catalyst Enables Replacing Dipolar Aprotic Solvents with Butyl Acetate

Abstract

Replacing dipolar and aprotic solvents with environmentally benign media has emerged as a new facet of green chemistry. In this paper, a sulfone‐containing imidazolium‐based Brønsted acid ionic liquid was prepared and used as a recyclable acid catalyst. The ionic liquid catalyst enables the use of an industrially acceptable and environmentally benign solvent, butyl acetate, as the reaction medium. The ionic liquid/butyl acetate biphasic system was successfully utilized in many organic reactions, which generally relied heavily on dipolar and aprotic solvents.magnified image

Oligo(3-methoxythiophene)s as Water-Soluble Dyes for Highly Lustrous Gold- and Bronze-like Metal-Effect Coatings and Printings

“…However, the oligomer was solvated in either nitromethane or acetonitrile that are considered to be employee-unsafe. 27 , 28 Typically, solvents deemed suitable for employee-safe environments are preferred for use (e.g., water). If its solvents can be replaced by the employee-safe solvents, then the oligomer is likely to have a very high significance with respect to its applications and chemistry.…”

Honeycomb-structured solid acid catalysts fabricated via the swelling-induced self-assembly of acidic poly(ionic liquid)s for highly efficient hydrolysis reactions

“…Reaction mechanism. Typically, acid-catalyzed reactions involve nucleophile substitution (SN1 and SN2) or elimination (E1) reaction mechanisms [7,18,19,[51][52][53]. In this study, the hydrolysis of cyclohexyl acetate was a typical nucleophile substitution reaction (SN2 mechanism).…”

Synthesis of 4-Substituted-1,2-Dihydroquinolines by Means of Gold-Catalyzed Intramolecular Hydroarylation Reaction of N-Ethoxycarbonyl-N-Propargylanilines

“…4-Substituted-1,2-dihydroquinolines represent key structural units in a variety of naturally occurring products/pharmaceuticals and are used as building blocks in organic synthesis [ 1 , 2 , 3 , 4 , 5 ]. Many methods for the synthesis of functionalized 1,2-dihydroquinolines are known, [ 1 ], but due to their pharmaceutical relevance, the development of practical approaches using mild reaction conditions remains an active research area [ 6 , 7 , 8 , 9 , 10 , 11 ]. Among them, the transition metal-catalyzed as well as the metal-free mediated intramolecular hydroarylation (IMHA) reactions involving the activation of the N -substituted- N -propargyl anilines carbon–carbon triple bond by using an electrophilic source have been extensively used [ 12 , 13 ].…”