REACTION OF SILYL-SUBSTITUTED AND SILA-BR IDGED BISCYCLOPENTADIENYL TETRACARBONYL DIIRON WITH HGCL2 AND STRUCTURES OF THE PRODUCTS

Reactions of bis(silylcyclopentadienyl) tetracarbonyl diiron compounds [eta 5-RC(5)H(4)Fe(CO)](2)(mu-CO)(2)(R=SiMe(3), 1; Si(2)Me(5), 2) wit h HgCl2 resulted in cleavage of Fe-Fe bond and gave expected products 5 similar to 8, while from the corresponding reactions of bridged anal ogues R(1)[eta(5)-C5H4Fe(CO)](2)(mu-CO)(2)(R(1)=SiMe(2), 3; SiMe(2)OSi Me(2), 4), unexpected products of disproportionation were isolated, as well as the expected ones. The occurrence of the disproportionation w as investigated. All the products were characterized by IR. H-1 NMR an d elemental analysis. The crystal structure of 5 was determined. The c rystals of 5 are monoclinic, space group P2(1)/n with a=1.1648(3), b=0 .7484(4), c=1.6823(5) nm and beta=106.55(2)degrees, V=1.405(2)nm(3), Z =4, D-x=2.29g . cm(-3).