Results 11 to 20 of about 9,597,280 (150)
Comptes Rendus. Chimie, 2012 Phenylboronic acid, a non-toxic compound, is used as catalyst for an efficient, rapid, and one-pot three-component synthesis of tetrahydrobenzo[ b ]pyrans in good to excellent yields. This new procedure has the advantages of operational simplicity, shorter reaction time, higher yields and ...
Nemouchi, Sara +3 more
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Synthesis of tetrahydrobenzo[b]pyran under catalysis of NH4Al(SO4)2·12H2O (Alum)
Arabian Journal of Chemistry, 2017 AbstractA simple and efficient one-pot synthesis of tetrahydrobenzo[b]pyrans from the three-component reaction between dimedone, aldehydes, and active methylene compounds using NH4Al(SO4)2·12H2O (Alum) as a catalyst at 80°C is described. The catalyst exhibits remarkable reactivity and is reusable.
Mohammadi, Ali A. +2 more
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Bulletin of the Chemical Society of Ethiopia, 2018 A green, efficient and simple technique for the synthesize of tetrahydrobenzo[b]pyrans through one-pot three-component reaction of dimedone, aromatic aldehydes and malonitrile as active methylene compound using immobilization of Preyssler heteropoly acid on Ni0.5Zn0.5Fe2O4 magnetite nanoparticles (MNPs), coated with hydroxyapatite (HA) as a catalyst is
Javid, A., Moeinpour, F.
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, 2022 Green Approach for Metal-free One-pot Synthesis of Tetrahydrobenzo[b]pyrans with Sodium Alginate as a Reusable Bifunctional Biopolymeric ...
Farzaneh Mohamadpour (8873822)
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Synthesis of 2-((3-(ethoxycarbonyl)-4,5,6,7-tetrahydrobenzo [b] thiophen-2-yl)amino)-4-(4-methoxyphenyl)-4-oxobut-2-enoate [PDF]
, 2022 2-((3-(Ethoxycarbonyl)-4,5,6,7-tetrahydrobenzo[b]thiophen-2-yl)amino)-4-(4-methoxyphenyl)-4-oxobut-2-enoate has been synthesized by the reaction of ethyl (E)-2-((5-(4-methoxyphenyl)-2-oxofuran-3(2H)-ylidene)amino)-4,5,6,7-tetrahydrobenzo[b]thiophene-3 ...
Roman V. Batuev +9 more
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Fructose-catalyzed synthesis of tetrahydrobenzo[b]pyran derivatives: Investigation of kinetics and mechanism [PDF]
Chinese Journal of Catalysis, 2015 Abstract Fructose was used as an efficient catalyst for three-component condensation reactions of aryl aldehydes, malononitrile, and dimedone in a mixture of EtOH and H2O as green solvents. The advantages of this method are a short reaction time, high yields, low cost, easy accesses, and simple work-up.
Sayyedeh Shadfar Pourpanah +2 more
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, 2021 One of the main drawbacks of supported ionic liquids is their low loading and consequently, low activity of the resultant catalysts. To furnish a solution to this issue, a novel heterocyclic ligand with multi imine sites was introduced on the surface of ...
Majid M. Heravi +3 more
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Journal of Chemistry, Volume 2014, Issue 1, 2014., 2014 Pentafluoropropionic acid (PFPA) efficiently catalyzes the one‐pot, three‐component reaction of aromatic aldehyde, malononitrile, and dimedone to yield tetrahydrobenzo[b]pyran derivatives in high yields. This method is of great value because of its easy processing, short reaction time, environmentally, and high yields.
Naser Montazeri +4 more
wiley +1 more source
One-pot two-step mechanochemical synthesis of arylsulfonyl 4H-pyrans
, 2022 In this paper, a simple and environment-friendly protocol was developed for the synthesis of arylsulfonyl 4H-pyrans via L-proline-catalyzed one-pot two-step reaction of aromatic aldehyde with phenylsulphonyl acetonitrile and dimedone under ball-milling ...
Qianqian Huang (1409008) +4 more
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Iranica Journal of Energy and Environment, 2017 This work is reported on the synthesis of Fe3O4/eggshell nanocomposites in the absence of any stabilizer or surfactant. Fe3O4 magnetic nanoparticles were established on the egg shell nano-composite. The nanocompositeshave shown high catalytic activities in the synthesis of Tetrahydrobenzo[b]pyran. These derivatives were synthesized via an one‐pot three‐
M. Naghizadeh +3 more
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