Al → Al₂O₃ → AlCl₃ → Al(OH)₃ → Na[Al(OH)₄]

This represents a sequence of transformations involving aluminum. It starts with elemental aluminum (Al), which is oxidized to aluminum oxide (Al₂O₃), then reacts to form aluminum chloride (AlCl₃), followed by precipitation of aluminum hydroxide (Al(OH)₃), and finally, reaction with a base to form sodium tetrahydroxoaluminate (Na[Al(OH)₄]).