Abstract
In this research, stearic acid and propylene oxide are used to synthesize biodegradable heterocyles (pyrazole, pyran, chromene, and pyrimidine) to improve their solubility and lower their toxicity. The chemical structure of these surfactants was confirmed using IR, 1H, and C-13 NMR spectra. Some of these compounds have higher activity than commercial antibiotics and may be useful in the pharmaceutical industry.