Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The 5,5-dichlorocyclopentadiene is a major, previously undetected and mechanistically significant product from the addition of dichlorocarbene to tetraphenylcyclopentadienone. ... : Calcd. for C 31 H 24 Cl 2 : C, 79.65; H, 5.18; Cl, 15.17. Found: C, 79.48; H, 5.15; Cl, 15.27. For : ...