N. Taniguchi et M. Uemura, PLANAR CHIRAL C-2-SYMMETRICAL BISFERROCENES - STEREOSELECTIVE PINACOLCOUPLING OF ALPHA-SUBSTITUTED FERROCENECARBOXALDEHYDES, Tetrahedron letters, 39(30), 1998, pp. 5385-5388
Planar chiral alpha-substituted ferrocenecarboxaldehydes were treated
with samarium diiodide to give stereoselectively pinacol coupling prod
ucts with a threo-configuration in good yields. The resulting dihydrox
yl of the product was substituted with stereochemical inversion by an
S(N)l reaction. (C) 1998 Elsevier Science Ltd. All rights reserved.