Front Cover Picture: Redox Active Sodium Iodide/Recyclable Heterogeneous Solid Acid: An Efficient Dual Catalytic System for Electrochemically Oxidative α-C−H Thiocyanation and Sulfenylation of Ketones (Adv. Synth. Catal. 7/2018)

Most photoredox catalysts in current use are precious metal complexes or synthetically elaborate organic dyes, the cost of which can impede their application for large-scale industrial processes. We found that a combination of triphenylphosphine and sodium iodide under 456-nanometer irradiation by blue light–emitting diodes can catalyze the alkylation of silyl enol ethers by decarboxylative coupling with redox-active esters in the absence of transition metals. Deaminative alkylation using Katritzky’s N-alkylpyridinium salts and trifluoromethylation using Togni’s reagent are also demonstrated. Moreover, the phosphine/iodide-based photoredox system catalyzes Minisci-type alkylation of N-heterocycles and can operate in tandem with chiral phosphoric acids to achieve high enantioselectivity in this reaction.

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

New Journal of Chemistry ◽

10.1039/c7nj00685c ◽

2017 ◽

Vol 41 (12) ◽

pp. 5133-5141 ◽

Cited By ~ 11

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).

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

RSC Advances ◽

10.1039/c5ra17489a ◽

2015 ◽

Vol 5 (110) ◽

pp. 90819-90837 ◽

Cited By ~ 9

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.

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

RSC Advances ◽

10.1039/c5ra06515a ◽

2015 ◽

Vol 5 (57) ◽

pp. 45974-45982 ◽

Cited By ~ 53

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.

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