STRUCTURES OF THE PENTAPHENYLCYCLOPENTADIENYL RADICAL, (PENTAPHENYLCYCLOPENTADIENYL)TIN(IV) TRICHLORIDE, AND BROMO(CHLORO)BIS(TETRAHYDROFURAN)TIN(II) - PRODUCTS OF THE REACTION OF C5PH5X WITH SNX2 (X = CL, BR)

The reaction of SnCl2 with C5Ph5Cl produces C5Ph5SnCl3 (1) in an oxida tive-addition reaction, while the pentaphenylcyclopentadienyl radical, C5Ph5., (2) is obtained in the reactions of C5Ph5Br with SnCl2 or SnB r2 in diethyl ether/tetrahydrofuran (THF). In the reaction of SnCl2 wi th C5Ph5Br, one of the tin halide products was shown to be SnBrCl(THF) (2) (3). The molecular structures of compounds 1-3 were determined by X-ray crystallography. Tin compound 1 is a-bonded to the cyclopentadie nyl ring; the radical 2 features a planar Cg ring, and the structure o f 3 consists of SnBrCl units coordinated by two THF molecules with an apparent stereochemical activity of the tin lone pair.