Citation: Ss. Ali et al., ORGANIC-REACTIONS IN THE AQUEOUS-MEDIUM .5. SPECTROSCOPIC AND CHROMATOGRAPHIC EVIDENCE FOR THE FORMATION OF TAUTOMERIC DIHYDROPYRIDINES IN THE REACTIONS OF BETA-DIKETO COMPOUNDS AND HEXAMETHYLENE TETRAMINE (HMTA), Journal of the Chemical Society of Pakistan, 16(3), 1994, pp. 199-206