SYNTHESIS AND REACTIONS OF 4R-1-SILACYCLOHEXA-2, 4-DIENETRICARBONYLIRON

1,1-Dialkyl-4R-1-silacyclohexa-2,4-dienes as well as 1,1-diaryl-4R-1-silacyclohexa-2,4-dienes (R = cyclo-C6H11, C(CH3)3, C6H5) react with Fe(CO)5 at 150-170°C to give Fe(CO)3 complexes. By the same method also the corresponding complexes of 1-silacyclohexa-2,4-dienes with functional groups at the silicon atom can be prepared. The 1-methyl-1-methoxy-(-isopropoyx-, -chloro-)4-cyclohexyl-1-silacyclohexa-2,4-dienes react with Fe(CO)5 at 180°C and form mixtures of diastereotopic endo/exo-Fe(CO)3 complexes. 1-Methyl-1,6-dichloro-4-cyclohexyl-1-silacyclohexa-2,4-diene reacts with Fe(CO)5 by reductive dimerisation at the 6-position to give the 6,6′-linked. 1-methyl-1-chloro-1-silacyclohexa-2,4-diene dimer, which forms a monoFe(CO)3 complex. The 90 MHz 1H NMR, 13C NMR, IR and mass spectra are discussed. © 1979.