Cyclization of Terphenyl-Bisfluorenols: A Mechanistic Study of the Regioselectvity.

The mechanism of the bicyclization reaction of a series of terphenyl-bisfluorenols into dispiro[fluorene-9,6'-indeno[1,2-b]fluorene-12',9''-fluorene] and dispiro[fluorene-9,6'-indeno[2,1-a]fluorene-12',9''-fluorene] is reported. Through a combined experimental and theoretical study, the different parameters that drive the regioselectivity of this cyclization reaction have been studied and are presented.