p-Toluenesulfonic acid → Benzonitrile, 4-[[(4-propylphenyl)methylene]amino]-

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Reaction Steps

A mixture of 5.9 g. of p-aminobenzonitrile and 7.4 g. of p-n-propylbenzaldehyde in 100 ml. of benzene is treated with 150 mg. of p-toluenesulfonic acid and reacted as described in Example 1. After evaporation, there remain 12.5 g. of a yellowish oil which crystallizes with cooling. Purification is carried out by several recrystallizations from isopropanol as described in Example 1. The p-[(p-n-propylbenzyliden)amino]-benzonitrile which is obtained has a melting point of 64.8°-65.5° C. and a clearing point of 77.6° C. UV (ethanol): ε280 = 24300 (shoulder at 310 nm). The nuclear magnetic resonance, mass spectrum, infrared and microanalysis data confirm the structure.

Provenance & Evidence