How is 5-Hydroxy-1-indanone (CAS: 3470-49-3) typically synthesized?

5-Hydroxy-1-indanone (CAS: 3470-49-3) is usually synthesized via the indanone ring closure and subsequent hydroxylation of an appropriate ketone. A common method involves the Wittig reaction followed by hydroxylation using hydrogen peroxide in the presence of a suitable catalyst like tetrabutylammonium hydroxide. The yield can be up to 90%, depending on the purity of the starting materials and reaction conditions.