Nickel (O)-catalyzed diene-aldehyde cyclization was realized. In this
reaction, oxidative cyclization between diene and aldehyde moiety occu
rs to give pi-allylnickel complex, and then beta-hydride elimination o
ccurs to give cyclized diene. Various diene-aldehydes having substitue
nts on the diene gave the cyclized products using Ni (O) in good to mo
derate yields. (C) 1998 Elsevier Science Ltd. All rights reserved.