98459-97-3Relevant academic research and scientific papers
HELICENES : SYNTHESE PHOTOCHIMIQUE ET ETUDE RMN 19F, 13 C ET 1H DE FLUORO-1-HEXAHELICENES ET FLUORO-1-HEPTAHELICENES.
Corsane, M.,Defay, N.,Martin, R. H.
, p. 215 - 232 (2007/10/02)
1-Fluorohexahelicene, 1-fluoroheptahelicene and 12 substituted derivatives of these fluorohelicenes have been synthesized by the photocyclodehydrogenation of 1-fluro-11-styrylbenzophenanthrenes (Table 2) and 1-fluoro-13-styrylpentahelicenes (Table 4) respectively.The photocyclisations to heptahelicenes were accompanied in five cases, by a side reaction, namely a photodefluoration.A new synthesis of heptahelicenes is described (25-->18 : 40 percent). 1H, 19F and 13C-NMR spectra are discussed. 19F and 13C-NMR spectra of 1-fluoro-, 1-fluoro-13-methyl- and 1-fluoro-13-methoxycarbonylpentahelicene (8d, 8a and 8 R=-CO2CH3) are also included.
