carbon monoxide; lithium chloride in methanol; acetone N2-atmosphere; addn. of LiCl (in MeOH) to Ru-complex (in Me2CO), refluxing for 5 min (pptn.), filtration off of dimethylhydrazine complex, bubbling CO (4 h) through refluxing filtrate;

carbon monoxide in methanol; acetone N2-atmosphere; addn. of LiBr (in MeOH) to Ru-complex (in Me2CO), refluxing for 5 min (pptn.), filtration off of dimethylhydrazine complex, bubbling CO (4 h) through refluxing filtrate;