A spirofluorenol such as 3',9'-dimethoxy-5'-hydroxyspiro[(1H-cyclopent[d,e,f]phenanthrene)-1,7'-benzo[c]fluorene] is produced by protecting a hydroxyl group bonded to a particular fluorenone compound such as 3,9-dimethoxy-5-hydroxybenzo[c]fluorene-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.
一种螺
芴醇,如 3',9'-二甲氧基-5'-羟基螺[(1H-环戊并[d,e,f]
菲)-1,7'-苯并[c]
芴],是通过保护与特定
芴酮化合物(如 3、9-二甲氧基-
5-羟基苯并[c]芴-7-酮 "中的取代
硅基,其中与
硅原子结合的取代基的碳原子数总和为 5 至 12"、例如 t-丁基二甲基
硅基,然后将
芴酮化合物与特定的有机
金属化合物(例如 1-
硫代
菲)反应,使其转变为螺环形式,然后去除其中的保护层。这种方法可以有效地生产出螺
芴醇,它可以作为生产光致变色化合物的起始原料。