Acid-catalysed cleavage of a 1,3-photoadduct of benzene and cis-3,4-dichlorocyclobutene: X-ray structure of 3,4-dichlorotricyclo[4,3,1, 0^2,5]dec-8-en-10-yl p-nitrobenzoate

The structure of the alcohol, obtained from acid treatment of the photoadduct (1) of benzene and cis-3,4-dichlorobutene, was established as (2) by a single crystal X-ray structure analysis of its p-nitrobenzoate racemate (3).