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Metathesis with a twist! A ring-closing-metathesis strategy has been developed for the preparation of various substituted 5helicene motifs and 6- and 7helicenes. The two optimized protocols include one method that utilizes the Grubbs second-generation catalyst under microwave-irradiation conditions and another that employs a modified Grubbs–Hoveyda catalyst at 40 °C in a sealed reaction vessel. (Mes=mesityl)
Collins et al. (Tue,) studied this question.