TlBF4; carbon monoxide in tetrahydrofuran byproducts: TlBr, (C6H5)3P; (Ar), to mixture of nickel complex and TlBF4 added THF previously saturated with CO, CO passed in for 30 min at -78°C; filtered, evaptd., washed (pentane, benzene), elem. anal., IR;

carbon monoxide in tetrahydrofuran byproducts: (C6H5)3P; (Ar), to nickel complex added THF previously saturated with CO, CO passed in for 2.5 h at -20°C, pptd.; ppt. after washing (THF, pentane) obtained (Ph3P)2NiBr2, filtrate evaptd., washed (pentane) extracted (ether), chromy (Al2O3, benzene/petroleumether 1:1), elem. anal., IR;

carbon monoxide in tetrahydrofuran byproducts: (C6H5)3P; (Ar), to nickel complex added THF previously saturated with CO, CO passed in for 2.5 h at -20°C, pptd.; ppt. after washing (THF, pentane) obtained (Ph3P)2NiBr2, filtrate evaptd., washed (pentane) extracted (ether), chromy (Al2O3, benzene/petroleumether 1:1), elem. anal., IR;

in neat (no solvent) byproducts: (C6H5)3P, H2; addn. of C2H5Br to ((C6H5)3P)3Ni(H)Br (3.07 mmol); stirring for 24 h at22°C (Ar-atmosphere);; evapg. react. mixt. to dryness, addn. of a small quantity of ether to residue; sepn. of product mixt. by extn. with CH3NO2; elem. anal., gas chromy.;;

in neat (no solvent) byproducts: H2, benzene, diphenyl; addn. of C6H5Br to ((C6H5)3P)3Ni(H)Br (3.42 mmol); stirring for 3 h at 22°C (Ar-atmosphere);; evapg. react. mixt. to dryness, addn. of a small quantity of ether to residue; further products: P(C6H5)3 and (C6H5)3PO; elem. anal., gas chromy. ;;