This invention at least the kind which is chosen from the group which at least consists of carboxylic acids, sulfonic acids and phosphoric acid in a kind of is chosen from midst of Lewis acid and solid acid in 2- adamantanoru and the method of producing 2- adamantanon, as the catalyst from 1- adamantanoru acid catalyst coexistence, it is 2- adamantanoru which uses the thing and 2 - 2- adamantanoru and 2 - to be production method of adamantanon, be able to produce adamantanon selectively efficiently without using sulfuric acid as the catalyst, spent acid processing process is reduced, at the same time because, reaction time is shortened substantially, in mass production ideal production methodIt offers.
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