Synthesis, NMR, and X-ray Molecular Structure of a Unique Chiral Propeller-Like Cobalt Complex [(Co2(CO)4)μ,η2,η2-(−H2CC⋮CCH2−)(−dppm)2][BF4]2 and Differentiation of Its Enantiomers by the Trisphat Anion

The unusual chiral two-bladed propeller cobalt complex [(Co 2 (CO) 4 )μ,η 2,η 2 -(−H 2 CC⋮CCH 2 −)(−dppm) 2 ][BF 4 ] 2 ( 3 ) has been prepared and its X-ray structure determined. Addition of the trisphat anion to a CD 2 Cl 2 solution of 3 has led to the NMR nonequivalency of the two enantiomers 3a,b . This is the first example in which a chiral propeller transition metal complex with C 2 -symmetry has been differentiated by the trisphat anion.