Rhodium Compounds tetrafluoroborate

Other irmovative approaches have been used to promote aromatization, once the RCM reaction involving the two alkenes has been accomplished. These two approaches are shown in Scheme 17.4. In the first one, triene 24 underwent an RCM reaction to afford the exocycUc double bond-containing compound 25 [18]. Use of the rhodium catalyst [RhCl(cod)]j then facihtated formation of the desired phenol 26. Another neat way to accomplish formation of the aromatic benzene ring was to allow the intermediate cyclic Michael acceptor 28 (formed by RCM of 27) to undergo a Heck-Mizoroki reaction with p-methoxybenzenediazonium tetrafluoroborate 30 to afford the second phenol 29 [18]. 

---