ammonium chloride in tetrahydrofuran Schlenck vessel, dry Ar atmosphere; soln. of Sn-compd. dropwise addn. tolanthanide compd. in THF (room temperature). stirring (3 h), decomposit on with NH4Cl soln., extraction by ether; ppt. filtration; elem. anal., gas-liquid chromy.;

ammonium chloride in tetrahydrofuran Schlenck vessel, dry Ar atmosphere; soln. of Sn-compd. dropwise addn. tolanthanide compd. in THF (room temperature). stirring (3 h), decomposit on with NH4Cl soln., extraction by ether; ppt. filtration; elem. anal., gas-liquid chromy.;

in not given mixing of dilute solutions at room temperature;

in water; benzene aq. HoCl3 soln. mixed with dimethyl oxalate in benzene, in a flask equipped with a reflux condenser;

in not given mixing of dilute solutions at 90°C;

in ethanol anhydrous ethanol; addn. Et3N to ligand soln., dropwise addn. chloride soln., heating under reflux for 8 h, concn. (pptn.); washing (cold EtOH, ether), recrystn. (EtOH/ether = 1:5); elem. anal.;