Rd. Theys et Mm. Hossain, ASYMMETRIC CYCLOPROPANATION REACTIONS VIA IRON CARBENE COMPLEXES HAVING CHIRALITY AT THE CARBENE LIGAND, Tetrahedron letters, 36(29), 1995, pp. 5113-5116
The reaction of Fp [(eta(5)-C5H5)Fe(CO)(2)] anion (1) with chiral (+)
or (-) o-anisaldehyde-(tricarbonyl)chromium (2) in the presence of chl
orotrimethylsilane produced the optically pure (+) or (-) bimetallic c
omplex 4. Separate treatment of 4 at -78 degrees C with trimethylsilyl
triflate in the presence of styrene, followed by decomplexation with i
odine, produced the corresponding cyclopropanes (10/1, cis/trans). A 6
0% ee was indicated for the cis cyclopropanes.