Yi-Ming Ren

PEG1000-Based Dicationic Acidic Ionic Liquid as an Efficient Catalyst for Mannich-Type Reaction in Water

Abstract PEG1000-based dicationic acidic ionic liquid (PEG1000-DAIL) was found to be an efficient and recyclable catalyst for Mannich-type reaction of different ketones with various aromatic aldehydes and aromatic amines in water to give various β-arylamino ketones in good yields. The catalytic system could be easily recovered and reused for at least six runs only with slight decrease in its activity. GRAPHICAL ABSTRACT

Convenient and efficient method for synthesis of 2,4,6-triarylpyridines using catalytic amount of PEG1000-based dicationic acidic ionic liquid under solvent-free conditions

ABSTRACT A convenient and efficient method for synthesis of substituted 2,4,6-triarylpyridines by the reaction of chalcones and ammonium acetate or via one-pot, three-component condensation of aromatic aldehydes with acetophenones and ammonium acetate has been developed by using the efficient catalyst PEG1000-based dicationic acidic ionic liquid (PEG1000-DAIL) under solvent-free conditions. Recycling studies have shown that the PEG1000-DAIL can be readily recovered and reused several times without significant loss of activity. GRAPHICAL ABSTRACT

Efficient method for the synthesis of 3-arylbenzoquinoline, pyranoquinoline, and thiopyranoquinoline derivatives using PEG1000-based dicationic acidic ionic liquid as recyclable catalyst via a one-pot multicomponent reaction

ABSTRACT A series of 3-arylbenzoquinoline, pyranoquinoline, and thiopyranoquinoline derivatives have been synthesized by one-pot, multicomponent reaction of aromatic aldehyde, naphthalen-2-amine, and ketone using polyethylene glycol (PEG1000)–based dicationic acidic ionic liquid as recyclable catalyst with high yields. The PEG ionic liquid and toluene have the advantages of both homogeneous and heterogeneous phases at different temperatures (biphasic conditions at lower temperatures and monophasic at higher temperatures) with the ease of product as well as catalyst separation. Recycling studies have shown that the ionic liquid can be readily recovered and reused several times without significant loss of activity. GRAPHICAL ABSTRACT

Highly efficient synthesis of arylnaphthalenes by modified fibre–palladium(II) complex catalysed Suzuki reaction in air

The modified fibre–palladium(II) complex was a highly efficient, recoverable and heterogeneous catalyst giving high yields in the synthesis of arylnaphthalenes by a Suzuki reaction in air. The heterogeneous catalyst can be readily recovered by simple filtration and reused at least six times without significant reduction in its activity.

Suzuki cross-coupling of aryl halides with phenylboronic acid catalysed by an amidoxime fibres-nickel(0) complex

Amidoxime fibres–nickel(0) complexes [Ni(0)–AOFs] were synthesised by combining a Ni2+-solution with amidoxime fibres and reduced by NaH2PO2. The Ni(0)–AOFs are inexpensive phosphine-free recyclable heterogeneous catalysts for the Suzuki coupling reaction of aryl halides with phenylboronic acid to provide the corresponding biphenyls in high yields. The heterogeneous catalyst can be readily recovered by simple filtration and reused several times without significant loss of activity.