SYNTHESIS OF PLATINUM COMPLEXES OF 2-METHYL-2,4,6-TRIS(TRIFLUOROMETHYL)-PYRAN. X-RAY CRYSTAL STRUCTURE OF (CYCLO-OCTA-1,5-DIENE)PLATINUM

Article abstract of DOI:10.1039/DT9800002095

Bis(cyclo-octa-1,5-diene)platinum reacts with 2-methyl-2,4,6-tris(trifluoromethyl)pyran to afford the complex .Fluorine-19, 1H NMR, and 13 C NMR spectroscopy showed that the pyran ligand was η²-co-ordinated to platinum.In order to define the structure rigorously an X-ray diffraction study was carried out at 218 K.Crystals are triclinic, space group PI, Z=2,in a unit cell with lattice parameters a=10.136(12), b=9.062(11), c=11.455(9) Angstroem, α=93.22(8), β=106.23(8), and γ=109.32(9) deg.The structure was refined to R 0.056 (R' 0.057) for 4 832 independent reflections with 2.9<=2θ<=50 deg (Mo-K_αX-radiation).The X-rey structure determination confirmed that the pyran ligand is η²-co-ordinated to the platinum atom.Moreover, the linkage is such that the platinum atom is attached to the C=C double bond having the C(Me)-(CF3) substituent.The pyran ring is essentially planar with the three CF3 substituents bent away from this plane to the far side from the platinum, while the Me substituent projects from the plane on the near side to the metal atom.Reaction of with PPh3 affords .Related complexes (L=CNBu^t or CNC6H3Me2-2,6) are obtained by reacting 2-methyl-2,4,6-tris(trifluoromethyl)pyran with the triplatinum compounds .Reaction between the pyran and yields .Fluorine-19 and 13C NMR studies reveal that the η² mode of attachment of the pyran to the platinum is similar to that established for the cyclo-octa-1,5-diene analogue.In contrast, 2-methyl-2,4,6-tris(trifluoromethyl)pyran reacts with (acac = acetylacetonate, pentane-2,4-dionate) to give .

Full text of DOI:10.1039/DT9800002095

View Article Online / Journal Homepage / Table of Contents for this issue

View Article Online

View Article Online

View Article Online

View Article Online

View Article Online

View Article Online