| 摘要 |
The invention provides a process of manufacturing an isoflavone of the general formula 7 wherein R1, R2, R3, and R4 each independently are H, OH, or an alkoxy, provided at least one of R1, R2, R3, and R4 being OH, and one being alkoxy, or at least 2 groups being OH, comprising providing ketone (3) wherein R1, R2, R3, and R4 are as stated above, combining (3) with trialkylortho formate, and a Lewis or Bronsted acid to produce the isoflavone, precipitating the isoflavone.
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