in dichloromethane 12 h; Inert atmosphere;

potassium carbonate in tetrahydrofuran; dichloromethane Irradiation (UV/VIS); under Ar; complex was dissolved in 1:1 solvent mixt., then cyclopentadiene and K2CO3 were added, mixt. was irradiated with visible light for 12 h (mercury luminescent lamp, 400 W); water was added to soln., mixt. was concd. in vac. at 50°C (to remove naphthalene and vapor), residue was dissolved in petroleum ether and eluted through alumina column, eluted fraction was concd., residue wasdried in vac.; NMR;