COMPLEXATION CHEMISTRY OF PERHALOGENATED CYCLOPENTADIENES AND ALKYNES.16. PREPARATION OF PI-CYCLOPENTADIENYL COMPLEXES WITH 2 AND 3 CHALCOGEN SUBSTITUENTS ON A RING [C(5)CL(4-M)(ER)(M)(ER')ML(N) (ML(N)=MNCO3,FE(C5H5) M=1 OR 2, E=S, SE, R, R'=ME, PH) - STRUCTURE OF [C(5)CL(3)(SME)(2)][C5H5]FE

(1,2,3,4,5)Pentachloroferrocene reacts with butyl lithium and then MeS SMe to give [C5Cl4(SMe)]FeCp (Cp = eta(5)-C5H5) (1). By repeating this procedure, [C5Cl3(SMe)(2)]FeCp (2) and [C5Cl2(SMe)(3)]FeCp (3) can be obtained. A crystal structure determination of 2 shows the two SMe gr oups in 1,3-orientation. A number of unsymmetrical cymantrenylbis- and tris(thioethers) (4-6) was prepared in a similar manner from [C5Cl4(S R)]Mn(CO)(3) or [C5Cl3(SR)(2)]Mn(CO)(3) (R = Me, Ph), respectively. Th e cymantrene selenoethers [C5Cl5-n(SeR)(n)]Mn(CO)(3) (7-10) (R = Me, n = 1, 2, 3; R = Ph, n = 2) were also prepared.