Sulfuric Acid → HCID 59434470, compound

Participants

Reaction Steps

In a nitrogen atmosphere, concentrated sulfuric acid (0.2 mL) was added to a mixture of 2-fluoro-4-hydroxybenzoic acid (13.8 g), 2,7-dihydroxy-9,9-dimethylfluorene (10.0 g), boric acid (0.3 g) and xylene (120 mL), and the mixture was heated under reflux for 6 hours while removing water. A deposited matter was filtered and rinsed with toluene. It was recrystallized from a mixed solvent of ethanol (75 mL) and acetone (75 mL) to provide 2,7-bis(4-hydroxy-2-fluorobenzoyloxy)-9,9-dimethylfluorene (compound [H3]) (7.77 g) in the form of pale rose solid.

Provenance & Evidence