| 摘要 |
PROBLEM TO BE SOLVED: To provide an economically and industrially advantageous method of producing 9-fluorenone and its derivatives on an industrial scale.SOLUTION: An economically and industrially advantageous method of producing 9-fluorenone and its derivatives comprises carrying out an intramolecular cyclization reaction of a biaryl carboxylic acid and its derivative in the presence of a rhodium salt and/or a rhodium complex and an acid anhydride. The efficiency of production of the compounds is improved further by adding an alkali metal halide or 1,2-bis(diphenylphosphino)ethane in the intramolecular cyclization reaction. |
