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- Title
Phosphotungstic acid-supported melamine–terephthalaldehyde covalent organic framework as a novel and reusable nanostructured catalyst in three-component synthesis of 2H-indazolo[2,1-b]phthalazine-trione derivatives.
- Authors
Saghanezhad, Seyyed Jafar; Vaccaro, Luigi; Zarei Ahmady, Amanollah; Farsi, Razieh
- Abstract
In this study, phosphotungstic acid (H3PW12O40)-supported melamine–terephthalaldehyde Covalent Organic Framework (COF-PTA) has been prepared as a novel solid acid catalyst for the synthesis of 2H-indazolo[2,1-b]phthalazine trions under solvent-free conditions. The catalyst was characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) and Brunauer–Emmett–Teller (BET) surface area analysis. The advantages of using this ecofriendly protocol include: excellent yield in a shorter time period, inexpensive chemicals without any use of solvents, simple experimental and work-up procedure. The catalyst was readily separated and was recycled for several runs with no significant loss of catalytic property.
- Subjects
SULFAMIC acid; CATALYST synthesis; ACID catalysts; SURFACE analysis; SCANNING electron microscopes; PHOSPHOTUNGSTIC acids
- Publication
Research on Chemical Intermediates, 2022, Vol 48, Issue 9, p3851
- ISSN
0922-6168
- Publication type
Article
- DOI
10.1007/s11164-022-04776-9