Anti- and syn-Tricyclo [4.2.1.12,5]decane. Preliminary communication

The two novel tricyclic C₁₀H₁₆ compounds anti- and syn-tricyclo 4.2.1.1^2,5]- decane ( 16 and 17 , respectively) were synthesized starting either from the photodimer 2 (anti) or the two cycloaddition products 8 (anti) and 9 (syn).