Bismuth triflate was found to be an efficient catalyst for the Claisen rearrangement of allyl naphthyl ethers. The reaction proceeds smoothly with a catalytic amount of bismuth triflate (20mol%) to afford the corresponding ortho-allyl naphthol in moderate to good yields in most cases.
[Van Otterlo, Willem A.L.; Morgans, Garreth L.; Madeley, Lee G.; Kuzvidza, Samuel; Moleele, Simon S.; Thornton, Natalie; De Koning, Charles B. Tetrahedron, 2005 , vol. 61, # 32 p. 7746 - 7755]