Synthesis Of Jasminaldehyde Catalyzed With Solid Base

Jasminaldehyde was synthesized from benzaldehyde and heptaldehyde under certain conditions. The difference is the choice of different catalytic system, co-catalysts, solvents, etc. Seeking more efficent catalyst for the synthesis of jasminaldehyde is still research and development direction in the future.In this paper, Ni-Al hydrotalcite was prepared by coprecipitation method and hydrothermal synthesis method. Resulted the crystallization of hydrotalcite, and used as a solid base to catalytic synthesis jasminaldehyde. The catalysts were characterized with X-ray diffraction, Fourier transform infrared spectroscopy, thermal gravimetric analysis and Hammett indicator method. The optimal reaction conditions were also investigated, the results was showed as follows:heptaldehyde conversion was97.35%, jasminealdehyde selectivity was85.21%and products yield was82.95%.Al2O3supported potassium fluoride were also prepared with conventional impregnation. The catalysts were characterized by means of X-ray diffraction, Hammett indicator method, and were employed for the synthesis of Jasminaldehyde. The reacton parameters were given as follows:temperature,120℃, catalyst loading,0.5%(m/m), the reactant molar ratio of benzaldehyde to aldehydeheptane is4:1, the heptaldehyde conversion was96.47%, jasminealdehyde selectivity was83.21%and product yield was80.27%.CaO/ZnO was also prepared and characterized by means of X-ray diffraction, N2adsorption-stripping and was used for the synthesis of jasminaldehyde. The reacton parameters were given as follows:the reactant molar ratio of benzaldehyde to aldehydeheptane is4:1, weight ratio of catalyst to reactants0.03, temperature120℃, reaction time12h, heptaldehyde conversion was96.47%, jasminealdehyde selectivity was83.21%and product yield was80.27%.