Synthesis of two isomers of (diphenylphosphino)indene and their platinum(II) complexes

Article abstract of DOI:10.1021/om00038a057

Deprotonation of indene followed by addition of Ph₂PCl yields one isomer of Ph₂PC₉H₇ (1a) which, on standing, converts to a second (1b). The crystal structure of 1b has been determined and reveals that the diphenylphoephino group is attached to an sp² carbon of the five-membered ring. The compound crystallizes in the monoclinic space group P2₁/c with a = 8.214 (2) ?, b = 16.651 (7) ?, c = 11.970 (4) ?, β = 93.37 (2)°, V = 1634.3 (10) ?³, and Z = 4. Least squares refinement converged at R = 0.0456 and R_w = 0.0415 based on 3280 reflections with F > 4.0σ(F). A series of platinum complexes of the type [PtCl_xMe_yL₂] (x + y = 2) has been isolated for each isomer. In the complexes of 1a the presence of a chiral carbon in the Ph₂PC₉H₇ ligands results in the formation of two pairs of diastereomers, which could be distinguished by NMR spectroscopy.