SYNTHESIS AND X-RAY STRUCTURE-ANALYSIS OF A(6)-C6H4(1,3-(CH3)(2)))(ETA(5)-C-5(C6H5)(5)](-)() [FECL4]()

Fe[C-5(C6H5)(5)] (CO)(2)Br (1) reacts with m-xylene at 80 degrees C fo llowed by hydrolysis with diluted HCl in the presence of air, to give 4{1,3-(CH3)(2)})(eta(5)-C-5(C6H5)(5)](+)[FeCl4](-) (3). The H-1, C-13 NMR and mass spectra as well as the single crystal X-ray diffraction a nalysis confirm the proposed sandwich cation structure. 3 crystallizes in the space group P2(1)/n with a = 984,0(1), b = 2201,0(7), c = 1684 ,9(2) pm, beta = 91,94(1)0 and V = 3647(1) x 10(-30)m(3). The final re finement resulted in R = 0,054 for 2982 observed reflections with F0 g reater than or equal to 4 sigma (F-0).