Cyclobutaarenes are highly strained compounds which exhibit unusual geometric features. Introduction of diphenyl substituents on the peripheral C atoms of the cyclobutene ring adds stereoelectronic effects and causes further distortion of the ring structure. The interatomic distances observed for the peripheral C-C bonds in the cyclobutene moiety of the two compounds are in the range 1.71-1.72 Å, among the longest of Csp3-Csp3 bonds previously reported for similar compounds. The core structure of the phenanthrodicyclobutene derivative is severely twisted due to non-bonding interactions between the chlorine substituents.
|Number of pages||4|
|Journal||Acta Crystallographica Section C: Crystal Structure Communications|
|State||Published - 15 Jan 1996|