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A new series of 3,3'-{alkane-α,ω-diylbis[imino-eth-1-yl-1-ylidene]}bis(6-methyl-2 H -pyran-2,4(3 H )-dione) derivatives (3c-e) has been synthesized by the convenient ultrasound-mediated condensation of diamine with dehydroacetic acid in the presence of a catalytic amount of   p- toluenesulfonic acid. The structure of all synthesized compounds was elucidated by IR spectroscopy, 1 H NMR spectroscopic spectra, elemental analysis, and mass spectroscopy. A tautomeric form for the derivatives species is also proposed.

A convenient synthesis of pyrandione derivatives using P-toluenesulfonic acid as catalyst under ultrasound irradiation