zinc in 2-methoxy-ethanol; water (N2 or Ar); mixt. of Ir complex, dppa and acid-washed Zn satd. with CO and pressurized to 4 atm; stirred at 90°C for 45 min; cooled, filtered under nitrogen, concd., chromd. on Florisil with petroleum ether-CH2Cl2 (5:1); recrystd. from THF-hexane; elem. anal.;