Hydrochloric Acid → Benzophenone

Participants

Reaction Conditions

Reaction Steps

With stirring under dry nitrogen, 2,2′-dihydroxy-1,1′-binaphthalene-3,3′-dicarboxylic acid (8.42 g, 22.5 mmol) was dissolved in dry tetrahydrofuran (500 mL) then cooled to −78° C. with a dry ice/acetone bath. Phenyllithium (100 mL of 1.8 M in 70/30 cyclohexane/ether, 0.18 mol) was added dropwise, then the solution was allowed to warm to ambient temperature. After stirring overnight, deionized water (50 mL) was slowly added to the reaction solution at 0° C. With vigorous stirring, 1 M hydrochloric acid was added dropwise until the water phase became strongly acidic (pH=2). The organic phase was washed with water in a separatory funnel, then dried over magnesium sulfate and evaporated. The orange residue was redissolved in dichloromethane and eluted through a silica gel plug. The orange filtrate was evaporated to yield 2,2′-dihydroxy-1,1′-binaphthalene-3,3′-bis (phenylketone) as a yellow solid (10.5 gm).

Provenance & Evidence