A novel polyaniline–fluoroboric acid–dodecylhydrogensulfate salt: versatile reusable polymer based solid acid catalyst for organic transformations

• Published in: Journal of molecular catalysis. A, Chemical Chemical, 2005-05, Vol.233 (1), p.9-15
• Main Authors: Palaniappan, Srinivasan, John, Amalraj
• Format: Article
• Language: English
• Subjects: Applied sciences; Carbonyl protection; Catalysis; Catalysts: preparations and properties; Chemistry; Condensation reaction; Esterification; Exact sciences and technology; General and physical chemistry; Organic polymers; PANI–HBF 4–DHS catalyst; Physicochemistry of polymers; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; Reusable catalyst; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 1381-1169; 1873-314X
• DOI: 10.1016/j.molcata.2005.02.002

A novel polyaniline–fluoroboric acid–dodecylhydrogensulfate (PANI–HBF 4–DHS) salt was directly synthesized via emulsion polymerization pathway. Aniline was oxidized to polyaniline salt by benzoyl peroxide in presence of sodium lauryl sulfate and fluoroboric acid. This polymerization pathway leads to incorporation of both acid group as well as surfactant group into the polyaniline chain as dopants. The polyaniline salt was characterized by Fourier transform infrared spectroscopy, electronic absorption spectroscopy, X-ray diffraction studies, scanning electron microscopy, elemental analysis, viscosity and conductivity measurements. PANI–HBF 4–DHS salt is used as catalyst for the first time in various organic reactions such as Mannich-type reaction, Biginelli reaction, Pechmann reaction, esterification and carbonyl protection. The advantages of the PANI–HBF 4–DHS salt are ease of preparation, easy handling, recovery, simple work-up, reusability and versatility. A novel polyaniline–fluoroboric acid–dodecylhydrogensulfate (PANI–HBF 4–DHS) salt was directly synthesized via emulsion polymerization pathway. PANI–HBF 4–DHS salt is used as catalyst for the first time in various organic reactions such as Mannich-type reaction, Biginelli reaction, Pechmann reaction, esterification and carbonyl protection. The advantages of the PANI–HBF 4–DHS salt are ease of preparation, easy handling, easy recovery, easy work-up, reusability and versatility. ▪