Amino functionalized chitosan as a catalyst for selective solvent-free self-condensation of linear aldehydes

作者：Jose Tharun; Sudheesh N; Shukla Ram S^*

来源：Journal of Molecular Catalysis A: Chemical , 2010, 333(1-2): 158-166.

DOI：10.1016/j.molcata.2010.10.012

• Chitosan
• Solid base catalyst
• Aldol condensation
• Aldehyde
• Kinetics

An aminopropyltrimethoxysilane functionalized chitosan was found to be an efficient solid base catalyst for the self-aldol condensation of linear aldehydes under solvent-free conditions. The modified catalyst was characterized using physical techniques, elemental analysis, FT-IR, and TGA. The modified chitosan was evaluated for the aldol condensation of C(3)-C(7) linear aldehydes in which the selective formation was obtained for alpha,beta-unsaturated aldehydes. A decreasing trend in the conversion from propanal to heptanal was observed. Propanal and pentanal were subjected for detail investigations to study the effect of parameters like amount of catalyst and aldehyde, and temperature on the conversion and selectivity. Kinetic performance of the modified chitosan investigated for a representative aldehyde, pentanal showed that the rate was increased with the catalyst amount, pentanal and temperature. The catalyst was reused up to six cycles without significant loss in its activity and selectivity.

• 出版日期2010-12-1
• 单位海洋化工研究院有限公司