sodium amalgam in tetrahydrofuran Mn2(CO)8(PPh3)2 converted with Na/Hg in THF into NaMn(CO)4PPh3, freshlydistd. MeOCOCH2Br in THF added at -20°C, stirred and warmed; evapd. in vac., extd. with ether, concd., chromd. (silica gel, -30°C, hexane/ether), concd., hexane added, fractionally crystd.; elem. anal.;

in not given anaerobic conditions, standard Schlenk technique; mechanism discussed;; not isolated, detected by IR and NMR spectroscopy;;

in hexane Irradiation (UV/VIS); N2 atmosphere; irradiation (366 nm, 20°C); not isolated; IR-spectroscopy;