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Nanosized sulfated SnO2 dispersed in the micropores of Al-pillared clay as an efficient catalyst for the synthesis of some biologically important molecules

Paper ID Volume ID Publish Year Pages File Format Full-Text
43906 45994 2007 9 PDF Available
Title
Nanosized sulfated SnO2 dispersed in the micropores of Al-pillared clay as an efficient catalyst for the synthesis of some biologically important molecules
Abstract

Nanosized sulfated tin oxide (STO) particles dispersed in the micropores of Al-pillared clay were prepared by a precipitation–deposition method followed by heat treatment and sulfation. The Al-pillared clays (Al-P) was prepared by the intercalation of [Al13O4(OH)24(H2O)12]7+ clusters into the clay interlayers. The physicochemical characteristics of the STO/Al-P material were evaluated by using X-ray diffraction (XRD), infrared (IR), transmission electron microscopy (TEM) and sorptometric studies. XRD results indicate an expansion in the interlayer spacing upon pillaring. The layer structure is found to be retained after the dispersion of the STO particles. The TEM images indicate the presence of uniform STO particles with sizes in the 5–15 nm range. The sorptometric study show a type I isotherm for both the Al-P and STO/Al-P material, indicating the presence of micropores. The pore volume of the parent-pillared clay was found to decrease upon supporting the STO particles. The STO/Al-P material was used as an environmentally benign, recyclable and efficient catalyst for the solvent-free synthesis of 3,4-dihydropyrimidin-2(1H)-ones, thiochromans, with selective protection of aldehyde groups such as 1,1-diacetates and coumarins. The STO/Al-P catalyst was highly active for the synthesis of the above-mentioned molecules. The protocol developed using this catalyst has many advantages over those of the conventional mineral acids used as catalysts.

Graphical abstractNanosize sulfated tin oxide dispersed in the micropores of Al-pillared clay has been demonstrated as an efficient catalyst for the benign solvent-free synthesis of 3,4-dihydropyrimidin-2(1H)-ones, thiochromans, selective protection of aldehyde groups as 1,1-diacetates and coumarins. The protocol developed using the nanosize catalyst offer many advantages in terms of simple experimentation, short reaction time, solvent-free conditions, catalyst reusability, high yield and purity of the products. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Pillared clay; Sulfated tin oxide; 3,4-Dihydropyrimidin-2(1H)-ones; Coumarins; Thiochromans; 1,1-Diacetates
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Nanosized sulfated SnO2 dispersed in the micropores of Al-pillared clay as an efficient catalyst for the synthesis of some biologically important molecules
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 333, Issue 2, 15 December 2007, Pages 272–280
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us