A. Taylor et al., ANTI-CIS-TRICYCLO[6.4.0.0(2,7)]DODECANE-3,12-DIONE AND -ANTI-CIS-TRICYCLO[6.4.0.0(2,7)]DODECANE-3,9-DIONE, Acta crystallographica. Section C, Crystal structure communications, 53, 1997, pp. 1963-1966
The single-crystal X-ray structures of two photochemical products of 2
-cyclohexenone have identified them as the head-to-head and head-to-ta
il cis-anti-cis dimers (C12H16O2) formed by 2+2 addition. The cyclobut
ane ring is twisted in the head-to-head isomer but flat in the head-to
-tail compound.