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Four novel unsymmetrical β-diketiminates 2-(2,6-diisopropylphenyl)amino-4-(phenyl)imino-2-pentene ( 4a ), 2-(2,6-diisopropylphenyl)amino-4-(4-methylphenyl)imino-2-pentene ( 4b ), 2-(2,6-diisopropylphenyl)amino-4-(4-methoxyphenyl)imino-2-pentene ( 4c ) and 2-(2,6-diisopropylphenyl)amino-4-(4-chlorophenyl)imino-2-pentene ( 4d ) were synthesized with a 77-84% yield, and were characterized by spectroscopic methods ( 1 H NMR,  13 C NMR, IR and mass spectrometry), elemental analysis, and X-ray single-crystal diffraction, respectively. Spectroscopic and X-ray single-crystal diffraction analyses determined the structures of the four β-diketiminates. While thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) showed two distinct endothermic peaks for each β-diketiminate at temperatures of 92.55°C and 221.50°C ( 4a ), 93.51°C and 238.82°C ( 4b ), 109.60°C and 329.22°C ( 4c ), 115.43°C and 243.25°C ( 4d ), respectively, corresponding to their melting and boiling points.

Syntheses, characterizations and thermal analyses of four novel unsymmetrical β-diketiminates