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Kirat Rawal,Manish Dixit,Meka Srinivasarao,Manish Kumar Mishra 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
The catalytic application of sulfated zirconia as solid Brønsted acid catalyst was explored for cross aldol condensation reactions (Claisen Schmidt reaction). The synthesized catalyst was highly active for solvent free synthesis of a,a9 -bis(arylidene)cycloalkanones by cross aldol condensation of aromatic aldehydes with cycloalkanones. The microwave assisted synthesis resulted increased yields of the products (79–99%) at significantly lower reaction temperature (120–140 8C) and reaction time (20 min) as compared to the synthesis by thermal heating (63–96% yield at 170 8C after 4 h). The microwave irradiation afforded selectively cross aldol products. The catalyst could be easily regenerated and reused several times with similar efficiency.