The Reaction of the Betain‐like Compound O 2 C 2 (PPh 3 ) 2 with [(cod)PtI 2 ] – Crystal Structure of the Salt (HC{PPh 3 } 2 )[(η 3 ‐C 8 H 11 )PtI 2 ]

The reaction of the betain‐like compound O 2 C 2 (PPh 3 ) 2 ( 1 ) with [(cod)PtX 2 ] in THF solution gives the salt‐like compounds (HC{PPh 3 } 2 )[(η 3 ‐C 8 H 11 )PtX 2 ] ( 3 , X = I; 4 , X = Cl) in about quantitative yields. The new η 3 ‐bonded C 8 H 11 ligand is the result of a proton transfer from the coordinated cod ligand to 1 with subsequent release of CO 2 . The X‐ray analysis of 3 shows the presence of two isomers in a 60:40 ratio, which differ in the bonding of the C 8 H 11 ligand. 3 crystallizes in the triclinic space group $\rm P{\bar 1}$ with the unit cell dimensions a = 1091.7(1), b = 1141.5(1), c = 1649.4(2) pm; α = 80.34(1)°, β = 83.62(1)°, γ = 89.03(1)°, V = 2013.7(4)·10 6 pm 3 , Z = 2.