Preparation and some properties of Pt(II) ruthenocenylacetylide complexes

Article abstract of DOI:10.1016/0022-328X(95)05815-7

Ruthenocenylacetylene reacted with trans-PtI(C₆H₄X-p)(PPh₃)₂ (X = H, Me, OMe, Cl or CO₂Me) in the presence of CuI in diethylamine-CH₂Cl₂ to give the Pt(II) ruthenocenylacetylide complexes, trans-Pt(C=CRc) (C₆H₄X-p)(PPh₃)₂ with a good yield. Similarly, cis-Pt(C=CRc)(C₆H₄OMe-p)(dppe) was prepared. The structure of trans-Pt(C=CRc)(C₆H₄CO₂Et-p)(PPh₃)₂ was determined by single-crystal X-ray diffraction. No reaction of the trans isomers with DDQ or AgBF₄ took place, while the cis isomer was oxidized with AgBF₄ to give the coupling products RcC=CC₆H₅OMe-p with a low yield. The oxidation of the cis isomer with iodine occurred on the Pt atom to afford p-MeOC₆H₄I and PtI₂(dppe) as the main products.