Prins condensation for synthesis of nopol from β-pinene and paraformaldehyde on novel Fe–Zn double metal cyanide solid acid catalyst

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• 作者：Mallikarjun V. Patil ; Mukesh K. Yadav ; Raksh V. Jasra
• 刊名：Journal of Molecular Catalysis A: Chemical
• 出版年：2007
• 出版时间：1 August 2007
• 年：2007
• 卷：273
• 期：1-2
• 页码：39-47
• 全文大小：1132 K

文摘

The present work describes the novel application of Fe–Zn double metal cyanide complexes as solid acid catalysts for the synthesis of nopol from β-pinene. The series of Fe–Zn double metal cyanide complexes were prepared from aqueous solutions of ZnCl₂ and K₄Fe(CN)₆·3H₂O in the presence of tert-butanol, iso-butanol and n-butanol (complexing agent) and tri-block copolymer EO₂₀PO₇₀EO₂₀ (average molecular weight, 5800; co-complexing agent). The catalysts prepared were characterized by X-ray diffraction, thermal analysis, diffuse reflectance UV–vis and FT-IR spectroscopy. All the catalysts were found to be active solid acid catalyst for Prins condensation reaction between paraformaldehyde and β-pinene in the synthesis of nopol. Coordinatively unsaturated Zn²⁺ ions in the framework of Fe–Zn double metal cyanide complexes are found to be possible active sites.