Oxidative addition of iodine, iodomethane and iodobenzene to the rhodium phosphino enolate complex [&unknown;Rh{Ph~2PCH&unknown;C(&unknown;O)Ph}(CO)(PPh~3)] and carbon monoxide insertion into the resulting Rh-carbon bond of [&unknown;Rh{Ph~2PCH&unknown;C(&unknown;O)Ph}Me(I)(CO)(PPh~3)]