Synthesis and Characterization of Planar-Chiral Cyclopentadienyliron Complexes (S)- and (R)-{η5-[1-Ph2(OH)C-2-Me-4-PhC5H2]}Fe(CO)2R (R = C⋮CPh, Me, SO2Me)
摘要:
The first enantiomerically pure planar-chiral cyclopentadienyliron complexes, (S)- and (R)-eta(5)-(CpFe)-Fe-c(CO)(2)R [Cp-c = 1-hydroxydiphenylmethyl-2-methyl-4-phenylcyclopentadienyl; R = C=CPh (6), Me (8)], in which the locus of chirality is in the cyclopentadienyl center, were synthesized from (CpFe)-Fe-a(CO)(2)I (4a: Cp-a = 1-(-)-menthoxycarbonyl-2-methyl-4-phenylcyclopentadienyl) and (CpFe)-Fe-b(CO)(2)I (4b: Cp-b = 1-(+)-menthoxycarbonyl-2-methyl-4-phenylcyclopentadienyl) and were isolated as a diastereomerically pure form by fractional recrystallization. The molecular structures of 4a and 4b, including the absolute configuration, have been established by an X-ray crystallographic analysis based on the configuration of the (-)- and (+)-menthyl groups.