8a OMe 8b OMe 9 (k= O) 11 (k= O) 13 (k= O) 10 (k= l) 12 (k= l) 14 (k= l) the formation of five- membered rings by acylpalladation is faster than that of six-membered rings.[3h1 Consequently, if a six-membered ring is formed in the second cyclization, premature