in tetrahydrofuran addn. of the chloroformaldiminium chloride to soln. of K salt (equimolar amounts) in THF at 0°C under stirring and under N2;; filtration after 10 min; concn.; chromy. (silica, -15°C, toluene: isolation of Cr arenes, then ether); evapn. in vac. to dryness; addn. of ether; recrystn. from toluene/petroleum ether; elem. anal.;;

in tetrahydrofuran byproducts: NaCl; Addn. of (C5H10NCHCl)Cl to soln. of Mn-complex under N2 with stirring, color changes to orange red.; Filtn., evapn. of solvent, dissolving in toluene, column chromy. (SiO2, 5°C, toluene), evapn. of the second zone in vac., recrystn. (pentane, -78°C), elem. anal.;

in tetrahydrofuran addn. of the chloroformaldiminium chloride to soln. of K salt (equimolar amounts) in THF at 0°C under stirring and under N2;; filtration after 10 min; concn.; chromy. (silica, -15°C, toluene: isolation of Cr arenes, the ether); evapn. in vac. to dryness; addn. of ether; recrystn. from toluene/petroleum ether; elem. anal.;;

oxalyl dichloride in dichloromethane 1.) -78 deg C, 10 min; -78 to 0 deg C, 30 min, 2.) 0 deg C, 30 min;