A synthesis of tricyclo [4.2.2.22,5]dodecane (19), a novel tricyclic C12H20 compound, is described. The key intermediate ketone 13 was prepared either from the C10‐photodimer 1 of cyclopentadienone or the C11‐cycloaddition products 11 and 12. 13 was also transformed to tricyclo [4.2.2.12,5]undecane (8).
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Ernst et al. (1978) studied this question.
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