SYNTHESIS AND CRYSTAL-STRUCTURES OF CARBONYLIRON AND CYCLOPENTADIENYLIRON DINUCLEAR COMPLEXES OF 2,3-DIETHYL-1,4-DIHYDRO-1,4-DIMETHYL-1,4-DIBORANAPHTHALENE

Reactions of the 1,4-Diboranaphthalene derivative 1a with (CO)3Fe(C8H14)2 lead to the orange anti dinuclear complex [(CO)3Fe(eta-6,eta-4-1a)Fe(CO)3] (4a) and to the cherry-red syn complex [(CO)3Fe(eta-4,eta-6-1a)Fe(CO)2] (5a). The X-ray structure of 5a reveals an Fe-Fe interaction (2.98 angstrom). la reacts with [(C5H5)Fe(C8H12)]2Zn to give the 30-VE triple-decker 7a, in which the diene of the benzo ring can be complexed with a Fe(CO)3 moiety to yield the trinuclear complex 9a.