Results 91 to 100 of about 136 (108)
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ChemInform, 2011
AbstractThe reaction of dimedone (Ia) with aldehydes (V) and malononitrile in the presence of equimolar amount of NH4OAc yields unexpected tetrahydrobenzopyrans instead of quinolines.
Kedar A. Undale +4 more
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AbstractThe reaction of dimedone (Ia) with aldehydes (V) and malononitrile in the presence of equimolar amount of NH4OAc yields unexpected tetrahydrobenzopyrans instead of quinolines.
Kedar A. Undale +4 more
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Research on Chemical Intermediates, 2017
We report here a new magnetically recyclable catalyst consisting of iron-substituted Keggin-type heteropolyacid (HPA) grafted on modified Fe3O4 nanoparticles. The synthesized hybrid nanomaterial exhibited the excellent catalytic efficiency in condensation reaction for the preparation of tetrahydrobenzo[b]pyrans under solvent-free conditions as well as ...
Hamid Reza Saadati-Moshtaghin +1 more
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We report here a new magnetically recyclable catalyst consisting of iron-substituted Keggin-type heteropolyacid (HPA) grafted on modified Fe3O4 nanoparticles. The synthesized hybrid nanomaterial exhibited the excellent catalytic efficiency in condensation reaction for the preparation of tetrahydrobenzo[b]pyrans under solvent-free conditions as well as ...
Hamid Reza Saadati-Moshtaghin +1 more
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Mendeleev Communications, 2011
Triethylenetetraammonium trifluoroacetate-catalyzed condensation of benzaldehydes, malononitrile and cyclic 1,3-dioxo compounds in aqueous medium affords the corresponding fused 2-amino-4-aryl-3-cyanopyrans.
Jia Zheng, Yiqun Li
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Triethylenetetraammonium trifluoroacetate-catalyzed condensation of benzaldehydes, malononitrile and cyclic 1,3-dioxo compounds in aqueous medium affords the corresponding fused 2-amino-4-aryl-3-cyanopyrans.
Jia Zheng, Yiqun Li
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ChemInform, 2016
AbstractTitle compounds are efficiently synthesized through a one‐pot, three‐component Knoevenagel—Michael—Thorpe—Ziegler cyclization sequence catalyzed by N,N‐dimethylbenzylamine.
Hamzeh Kiyani, Mozhgan Sadat Jalali
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AbstractTitle compounds are efficiently synthesized through a one‐pot, three‐component Knoevenagel—Michael—Thorpe—Ziegler cyclization sequence catalyzed by N,N‐dimethylbenzylamine.
Hamzeh Kiyani, Mozhgan Sadat Jalali
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Polyaniline/SiO2 Catalyzed One-pot Synthesis of Tetrahydrobenzo[b]pyran Derivatives
2010Polyaniline/SiO2 is an efficient catalyst for the synthesis of tetrahydrobenzo[b]pyran derivatives from a one-pot, three component, condensation of aldehydes, malononitrile and dimedone at room temperature. This protocol has several advantages such as high yield, a simple work up procedure, low toxicity and easy recovery and reusability of the ...
Yelwande, Ajeet A. +2 more
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Inorganic and Nano-Metal Chemistry, 2016
ABSTRACTThe efforts to use green catalysts for organic synthesis are undeniable. Natural catalysts are biodegradable and easy to access. Herein, glutamic acid was applied as a natural and green catalyst for the synthesis of tetrahydrobenzo[b]pyran and 3,4-dihydropyrimidinone derivatives under solvent-free and thermal conditions.
Khatereh Khandan-Barani +3 more
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ABSTRACTThe efforts to use green catalysts for organic synthesis are undeniable. Natural catalysts are biodegradable and easy to access. Herein, glutamic acid was applied as a natural and green catalyst for the synthesis of tetrahydrobenzo[b]pyran and 3,4-dihydropyrimidinone derivatives under solvent-free and thermal conditions.
Khatereh Khandan-Barani +3 more
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Catalysis Letters, 2009
An efficient, rapid, one-pot synthesis of tetrahydrobenzo[b]pyran is achieved via a three-component reaction of aldehydes, 1,3-diketone, malononitrile in 20% ethanol using anhydrous potassium phosphate as a catalyst at room temperature. The key advantages are the short reaction time, high yields, simple work-up, inexpensive catalyst and purification of
D. M. Pore +3 more
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An efficient, rapid, one-pot synthesis of tetrahydrobenzo[b]pyran is achieved via a three-component reaction of aldehydes, 1,3-diketone, malononitrile in 20% ethanol using anhydrous potassium phosphate as a catalyst at room temperature. The key advantages are the short reaction time, high yields, simple work-up, inexpensive catalyst and purification of
D. M. Pore +3 more
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Three-Component Synthesis of Tetrahydrobenzo[b]pyrans Catalyzed by Sodium Cyclamate
HETEROCYCLES, 2022Hamzeh Kiyani, Fatemeh Baghaie
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Electrochemical synthesis of tetrahydrobenzo[b]pyran derivatives in deep eutectic solvents
Journal of Electroanalytical Chemistry, 2022Eman O. Osman +3 more
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ChemInform Abstract: Cerium(III) Chloride Catalyzed One‐Pot Synthesis of Tetrahydrobenzo[b]pyrans
ChemInform, 2009AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Gowravaram Sabitha +4 more
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