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RAMIN REZAEI et al.
In the case of aliphatic aldehydes, however, only poor yields of imines (10-15%) are obtained
with complex by-product formation that was not included in Table 1. It was shown in Table 1 that
withdrawing groups on benzaldehyde derivatives such as Cl, NO2 decrease the time of the reaction
probably due to increasing the positive property of carbonyl group, but was not case sensitive for
yield of products. As a model compound, we were examined the reaction with various aniline
derivatives. Best results are obtained with derivatives involving electron donating groups.
Conclusion
It can be concluded that the melamine formaldehyde as a solid support, can be used as an
efficient, excellent, readily available and cheap catalyst in conversion of aldehydes to imines
under microwave irradiation. Furthermore, the reaction is a green process and the catalyst is
recyclable for several uses. The advantages of the present method in terms of facile
manipulation, fast reaction rates and formation of cleaner products under neat reaction
conditions should make this protocol as a valuable alternative to the existing methods.
Acknowledgment
We gratefully thank the chemical research center of Islamic Azad University, Firoozabad
Branch for their financial support of this work.
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Rezaei, Ramin
