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Selected sets of tetrahydro-5,5′-bi(1,2,4-triazines) ( 1–3 ) appended with acetyl, benzoyl, and ester moieties at C-3 position and  N -1 ( p -substituted)phenyl ring have been prepared and characterized by spectral (IR, NMR, MS) data and X-ray diffraction for compound  3a . Their synthesis was achieved in high yield via the reaction of diethyl aminomalonate with various  N -(aryl)hydrazonoyl chlorides in the presence of triethylamine.

Bis-heterocycles. Part I: tetrahydro-5,5′- bi(1,2,4-triazin-6-ones)