in tetrahydrofuran addn. of equimolar amount of cyclopropene to soln. of K salt in THF at ambient temp. under N2; stirring for 15 min;; evapn. to dryness; addn. of toluene; filtration; concn.; chromy. (silica, -10°C, toluene: isolation of Cr arenes, then ether); concn.; dissolving in toluene and addn. of petroleum ether; storage at - 78°C; pptn.; 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.;;

in tetrahydrofuran addn. of (CH3)2NC(H)Cl2 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 hydride, then ether); evapn. in vac. to dryness; addn. of ether; recrystn. from toluene/petroleum ether;;

in tetrahydrofuran addn. of pyridinium salt (excess) to filtrated soln. of K salt in THF at ambient temp. under N2;; evapn. in vac. after 3 h; addn. of toluene; filtration through Celite; 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 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 addn. of equimolar amount of cyclopropene to soln. of K salt in THF under N2;; evapn. to dryness; addn. of toluene; filtration; concn.; chromy. (silica, toluene: isolation of Cr arenes, ether: isolation of Cr carbene);;