Phloroglucinol is the organic compound that is used in the synthesis. This molecule exists in two forms, or tautomers, 1,3,5-trihydroxybenzene, which has phenol-like, and 1,3,5--cyclohexanetrione, which has ketone-like character. These two tautomers are in equilibrium. Phloroglucinol is a useful intermediate because it is polyfunctional.
From water, phloroglucinol crystallizes as the dihydrate, which has a melting point of 116-117 °C, but the anhydrous form melts much higher, at 218-220 °C. It does not boil intact, but it does sublime.
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