scholarly journals Continuous-flow hydration–condensation reaction: Synthesis of α,β-unsaturated ketones from alkynes and aldehydes by using a heterogeneous solid acid catalyst

2011 ◽  
Vol 7 ◽  
pp. 1680-1687 ◽  
Author(s):  
Magnus Rueping ◽  
Teerawut Bootwicha ◽  
Hannah Baars ◽  
Erli Sugiono
Keyword(s):  
Heterogeneous Catalyst ◽  
Continuous Flow ◽  
Solid Acid ◽  
Condensation Reaction ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Reaction Synthesis ◽  
Unsaturated Ketones ◽  
Heterogeneous Solid ◽  
Convenient Access

A simple, practical and efficient continuous-flow hydration–condensation protocol was developed for the synthesis of α,β-unsaturated ketones starting from alkynes and aldehydes by employing a heterogeneous catalyst in a flow microwave. The procedure presents a straightforward and convenient access to valuable differently substituted chalcones and can be applied on multigram scale.

Melamine trisulfonic acid (MTSA): an efficient and recyclable heterogeneous catalyst in green organic synthesis

RSC Advances ◽  
2015 ◽  
Vol 5 (110) ◽  
pp. 90819-90837 ◽  
Author(s):  
Rajesh H. Vekariya ◽  
Kinjal D. Patel ◽  
Hitesh D. Patel
Keyword(s):  
Heterogeneous Catalyst ◽  
Organic Synthesis ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Organic Transformations ◽  
Highly Efficient ◽  
Recyclable Heterogeneous Catalyst ◽  
Melamine Trisulfonic Acid ◽  
Heterogeneous Solid

Melamine trisulfonic acid (MTSA) as a highly efficient heterogeneous solid acid catalyst catalyzes various organic transformations.

scholarly journals Concatenated Batch and Continuous Flow Procedures for the Upgrading of Glycerol-Derived Aminodiols via N-Acetylation and Acetalization Reactions

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 21
Author(s):  
Davide Rigo ◽  
Nadia Alessandra Carmo Dos Santos ◽  
Alvise Perosa ◽  
Maurizio Selva
Keyword(s):  
Continuous Flow ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Catalyst Free ◽  
Amide Derivatives ◽  
Amide Acetal ◽  
Enol Ester ◽  
Isopropenyl Acetate

An unprecedented two-step sequence was designed by combining batch and continuous flow (CF) protocols for the upgrading of two aminodiol regioisomers derived from glycerol, i.e., 3-amino-1,2-propanediol and 2-amino-1,3-propanediol (serinol). Under batch conditions, at 80–90 °C, both substrates were quantitatively converted into the corresponding amides through a catalyst-free N-acetylation reaction mediated by an innocuous enol ester as isopropenyl acetate (iPAc). Thereafter, at 30–100 °C and 1–10 atm, the amide derivatives underwent a selective CF-acetalisation in the presence of acetone and a solid acid catalyst, to afford the double-functionalized (amide-acetal) products.

FeCl3–SiO2 as heterogeneous catalysts for the preparation of dihydropyrano[3,2-b]chromenediones

2011 ◽  
Vol 76 (12) ◽  
pp. 1791-1797 ◽  
Author(s):  
Wei-Lin Li ◽  
Jin-Ying Liang ◽  
Tian-Bao Wang ◽  
Ya-Qin Yang
Keyword(s):  
Heterogeneous Catalyst ◽  
Heterogeneous Catalysts ◽  
Solid Acid ◽  
Kojic Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Environment Friendly ◽  
Appreciable Change

FeCl3–SiO2 is environment-friendly heterogeneous catalyst for the condensation of kojic acid and aldehydes with dimedone to afford dihydropyrano[3,2-b]chromenediones. The solid acid catalyst is stable and can be easily recovered and reused without appreciable change in its efficiency.

Nanosized sulfated zirconia as solid acid catalyst for the synthesis of 2-substituted benzimidazoles

2013 ◽  
Vol 67 (5) ◽  
Author(s):  
Mohammad Abdollahi-Alibeik ◽  
Mohammad Hajihakimi
Keyword(s):  
Sulfated Zirconia ◽  
Tetragonal Phase ◽  
Solid Acid ◽  
Condensation Reaction ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Ft Ir

AbstractThe condensation reaction of o-phenylenediamine and arylaldehydes was investigated in the presence of nanosized sulfated zirconia (SO42−-ZrO2) as the solid acid catalyst. Nanosized SO42−-ZrO2 was prepared and characterized by the XRD, FT-IR, and SEM techniques. The results confirm good stabilization of the tetragonal phase of zirconia in the presence of sulfate. Reusability experiments showed partial deactivation of the catalyst after each run; good reusability can be achieved after calcinations of the recovered catalyst before its reuse.

Covalently anchored sulfamic acid on cellulose as heterogeneous solid acid catalyst for the synthesis of structurally symmetrical and unsymmetrical 1,4-dihydropyridine derivatives

2017 ◽  
Vol 41 (12) ◽  
pp. 5133-5141 ◽  
Author(s):  
Shrikrishna Karhale ◽  
Chandrakant Bhenki ◽  
Gajanan Rashinkar ◽  
Vasant Helavi
Keyword(s):  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Sulfamic Acid ◽  
Acid Catalyst ◽  
Covalent Grafting ◽  
Heterogeneous Solid ◽  
Dihydropyridine Derivatives

A novel heterogeneous solid acid catalyst has been prepared by covalent grafting of chlorosulphonic acid on amino-functionalized cellulose (Cell–Pr-NHSO3H).

Synthesis of 2,3-dihydroquinazolin-4(1H)-ones catalyzed by Perchlorated Zirconia (HClO4/ZrO2) nanoparticles as a novel solid acid catalyst

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
Seyed Yousef Mosavian
Keyword(s):  
Solid Acid ◽  
Condensation Reaction ◽  
Solid Acid Catalyst ◽  
Sol Gel ◽  
Acid Catalyst ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Zro2 Nanoparticles ◽  
Calcination Temperatures ◽  
Aldehydes And Ketones

Zirconia was synthesized in nanosize by sol-gel method and perchlorated zirconia (HClO4/ZrO2) with various calcination temperatures were prepared and characterized by XRD, FTIR and SEM techniques. The catalyst acidity characters, including the acidicstrength and the total number of acid sites were determined by potentiometric titration. The catalytic performance experiments show that the HClO4/ZrO2 with calcination temperature of 300 °C has the best catalytic activity. 2,3-Dihydroquinazolin-4(1H)-ones wereprepared in good to excellent yields via condensation reaction of oaminobenzamide and various types of aldehydes and ketones in the presence of HClO4/ZrO2 nanoparticles as an efficient solid acid catalyst. The catalyst is reusable with moderate loss in activity.

TiO2-coated magnetite nanoparticle-supported sulfonic acid as a new, efficient, magnetically separable and reusable heterogeneous solid acid catalyst for multicomponent reactions

RSC Advances ◽  
2015 ◽  
Vol 5 (57) ◽  
pp. 45974-45982 ◽  
Author(s):  
Ali Amoozadeh ◽  
Sanaz Golian ◽  
Salman Rahmani
Keyword(s):  
Magnetite Nanoparticles ◽  
Sulfonic Acid ◽  
Multicomponent Reactions ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Magnetite Nanoparticle ◽  
Magnetically Separable ◽  
Heterogeneous Solid

TiO2-coated magnetite nanoparticles-supported sulfonic acid (nano-Fe3O4–TiO2–SO3H (n-FTSA)) is synthesized by the immobilization of –SO3H groups on the surface of nano-Fe3O4–TiO2.

SO3H-functionalized mesoporous silica materials as solid acid catalyst for facile and solvent-free synthesis of 2H-indazolo[2,1-b]phthalazine-1,6,11-trione derivatives

2015 ◽  
Vol 39 (12) ◽  
pp. 9665-9671 ◽  
Author(s):  
Ali Alinasab Amiri ◽  
Shahrzad Javanshir ◽  
Zahra Dolatkhah ◽  
Mohammad G. Dekamin
Keyword(s):  
Mesoporous Silica ◽  
Solid Acid ◽  
Condensation Reaction ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
One Pot ◽  
Functionalized Mesoporous Silica ◽  
Silica Materials ◽  
Mesoporous Silica Materials ◽  
Solvent Free Synthesis

SO3H-functionalized mesoporous silica materials were used to synthesize 2H-indazolo[2,1-b]phthalazine-1,6,11-trione derivatives in a one-pot three-component condensation reaction.

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