Hydrolysis of aluminum isopropoxide with excess water in the presence of excess isopropyl alcohol resulted in the formation of boehmite in independence of temperature of hydrolysis and aging. Stoichiometric and substoichiometric amount of water hydrolyzed aluminum isopropoxide to pseudo-boehmite and amorphous one, respectively. $alpha$-Al2O3 with 0.3${mu}{ extrm}{m}$ in median size was produced by calcination of boehmite, bseudo-boehmite and amorphous boehmite at 125$0^{circ}C$, 120$0^{circ}C$, and 115$0^{circ}C$ for one hour, respectively. Singnificant reduction in particle size was found during transition from $ heta$-Al2O3 to $alpha$-Al2O3. $alpha$-Al2O3 produced in this study was relatively uniform spherical and its purity was found to be over 99.9%.