Mesoporous silica polymer nanocomposites encapsulated with polyphosphoric acid for the synthesis of β-amino carbonyl compounds under environmental benign conditions. (3rd February 2015)

• Record Type: Journal Article
• Authors: Sachdev, Divya; Dubey, Amit; Wilson, G. Robin; Sharma, Ankita
• Is Part Of: New journal of chemistry. Volume 39:Number 4(2015:Apr.)
• Page Start: 2633
• Page End: 2641
• Publication Date: 2015-02-03
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c4nj01748j
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Hydrophobic polymer functionalized SBA-15 was impregnated with polyphosphoric acid. Polymer composites SAR displays a crucial role in the selective synthesis of Mannich base. Abstract : Mesoporous silica–polymer nanocomposites (SBA/PS) synthesized via wet impregnation method were functionalized by mild polyphosphoric acid (PPA) for catalytic applications. The catalysts were characterized and analysed by powder X-ray diffraction (PXRD), solid state nuclear magnetic resonance ( 31 P-SSNMR), N2 -adsorption–desorption isotherm, Fourier transform-infrared (FT-IR), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM) and thermogravimetric analysis (TGA/DTA). The catalytic studies of a multicomponent Mannich reaction was conducted wherein the hydrophobic nature of these nanocomposites showed an enhancement in the product activity and selectivity of β-amino carbonyl (Mannich base) compounds. The probable reaction mechanism elucidates the role of well-distributed active sites on the hydrophobic surface and the stability of the catalyst for good catalytic activity.