in acetonitrile-D3 Me2Os(CO)4, HRe(CO)5 (1:4 molar ratio), and CD3CN were sealed in an NMRtube and heated at 60°C for 10 d; the tube was broken open on the vac. line, volatile components (-196°C) were collected via a Toepler pump, and analysed by GC, nonvolatile residue was subjected to preparative layer chromy.; yield of MeCHO was detd. by (1)H NMR, of CH4 - by GC;

in benzene-d6 equimolar amts.; in C6D6/Me4Si; product mixt. not sepd., detd. by NMR spectroscopy;

-80°C (N2); not isolated, detected by IR;

in solid matrix byproducts: HCO radical; Irradiation (UV/VIS); in solid CO;

-80°C (N2); not isolated, detected by IR;