Journal ArticleDOI
Green and efficient Knoevenagel condensation catalysed by a DBU based ionic liquid in water
TLDR
An efficient and facile protocol for the Knoevenagel condensation of aromatic aldehydes with active methylene compounds with task specific ionic liquid 1,8-diazabicyclo[5.4.0]-undec-... was proposed in this paper.Abstract:
An efficient, clean and facile protocol for the Knoevenagel condensation of aromatic aldehydes with active methylene compounds catalysed by task specific ionic liquid 1,8-diazabicyclo[5.4.0]-undec-...read more
Citations
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Knoevenagel condensation catalyzed by a tertiary-amine functionalized polyacrylonitrile fiber
Guowei Li,Jia Xiao,Wenqin Zhang +2 more
TL;DR: In this paper, a new fiber catalyst for Knoevenagel condensation has been prepared by aminating a commercially available polyacrylonitrile fiber with N,N-dimethyl-1,3-propanediamine.
Journal ArticleDOI
Silica-bonded 5-n-propyl-octahydro-pyrimido[1,2-a]azepinium chloride (SB-DBU)Cl as a highly efficient, heterogeneous and recyclable silica-supported ionic liquid catalyst for the synthesis of benzo[b]pyran, bis(benzo[b]pyran) and spiro-pyran derivatives
TL;DR: The reaction of 3-chloropropyl silica (SilprCl) with 1,8-diazabicyclo[540]undec-7-ene (DBU) in dry acetone affords silica-bonded 5npropyl-octahydro-pyrimido[1,2-a]azepinium chloride (SB-DBUCl) as a new silicasupported ionic liquid catalyst.
Journal ArticleDOI
Novel DABCO Based Ionic Liquids: Green and Efficient Catalysts with Dual Catalytic Roles for Aqueous Knoevenagel Condensation
TL;DR: In this paper, four basic ionic liquids (ILs), based on 1,4-diazobicyclo[2.2] octane (DABCO) and 3-chloro-1,2-propanediol, have been introduced as catalysts for Knoevenagel condensation.
Journal ArticleDOI
An environmentally benign protocol for aqueous synthesis of tetrahydrobenzo[b]pyrans catalyzed by cost-effective ionic liquid
TL;DR: Key features of the reported methodology include good to excellent yields of desired products, simple work-up procedure and good recyclability of catalysts, which may be a practical alternative to the existing conventional processes for the preparation of 4-H pyrans to cater to the requirements of academia as well as industry.
References
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Journal ArticleDOI
Ionic-Liquid-Supported Synthesis: A Novel Liquid-Phase Strategy for Organic Synthesis
Weishi Miao,Tak Hang Chan +1 more
TL;DR: Ionic-liquid-supported synthesis (ILSS) has been applied to the preparation of oligopeptides and oligosaccharides and the comparison of ILSS with solid-phase synthesis, soluble-polymer- supported synthesis, and fluorous phase synthesis has been highlighted where applicable.
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Substituted Quinodimethans. I. Preparation and Chemistry of 7,7,8,8-Tetracyanoquinodimethan
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Zinc chloride as a new catalyst for knoevenagel condensation
TL;DR: In this article, the knoevenagel condensation of carbonyl substrates with acidic methylene reagents proceeds smoothly in presence of zinc chloride, without the need for solvent, to produce products of good purity in high yield.
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Phosphane‐Catalyzed Knoevenagel Condensation: A Facile Synthesis of α‐Cyanoacrylates and α‐Cyanoacrylonitriles
TL;DR: In this paper, Triphenylphosphane (TPP) was used as a novel and efficient catalyst for the Knoevenagel condensation of aldehydes with acidic methylene compounds such as ethyl cyanoacetate and malononitrile to afford substituted olefins.
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Uncatalysed Knoevenagel condensation in aqueous medium at room temperature
Mohit L. Deb,Pulak J. Bhuyan +1 more
TL;DR: In this article, the condensation of various aromatic and heteroaromatic aldehydes with active methylene compounds like malononitrile, e.g., barbituric acids, Meldrum's acid, dimedone and pyrazolone is described.