98460-13-0Relevant academic research and scientific papers
Expeditious synthesis of helicenes using an improved protocol of photocyclodehydrogenation of stilbenes
Talele, Harish R.,Chaudhary, Anju R.,Patel, Parthiv R.,Bedekar, Ashutosh V.
, p. 15 - 37 (2011/06/19)
An improved procedure has been developed for photodehydrocyclization of stilbenes for the synthesis of phenanthrenes and helicenes. This procedure involves the use of THF as a scavenger of hydriodic acid produced during iodine mediated photodehydrocyclization. The use of THF is advantageous due to its higher boiling point, lower cost and easy availability as compared to propylene oxide. The method is applied to synthesize a number of phenanthrenes and helicenes. ARKAT-USA, Inc.
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.
