How is (4-Acetylphenyl)boronic acid (CAS: 149104-90-5) typically synthesized?

(4-Acetylphenyl)boronic acid can be synthesized via several methods. One common approach involves the reduction of (4-acetylphenyl)boronic ester with sodium borohydride in an aqueous solution. Another method involves the direct reaction of 4-acetylphenol with boron tribromide in an inert solvent. The yield is typically 70-80%, and the purity can be increased through recrystallization.