| 摘要 |
A spirofluorenol such as 3',9'-dimethoxy-5'-hydroxyspiroÄ(1H-cyclopentÄd,e,fÜphenanthrene)-1,7'-benzoÄcÜfluoreneÜ is produced by protecting a hydroxyl group bonded to a particular fluorenone compound such as 3,9-dimethoxy-5-hydroxybenzoÄcÜfluorene-7-one with "a substituted silyl group in which the sum of carbon atoms of substituents bonded to a silicon atom is 5 to 12", such as a t-butyldimethylsilyl group, then, reacting the fluorenone compound with a particular organometal compound such as 1-lithiophenanthrene so as to be transformed into a spiro form and, then, removing the protection therefrom. This method makes it possible to efficiently produce the spirofluorenol which is useful as a starting material for producing photochromic compounds.
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