{(R,SFc,SFc)-2′′-Bromo-2-[1-(dimethylamino)ethyl-κN]-1,1′′-biferrocene}trihydridoboron

Abstract

The title structure, [Fe2(C5H5)2(C14H19BBrN)], contains a chiral and asymmetrically 2,2′′-disubstituted biferrocene designed as precursor for enantioselective non-C2-symmetric biferrocenyldiphosphine catalysts. The mean bond lengths in the biferrocene unit are Fe—C = 2.048 (10) Å and C—C = 1.427 (8) Å within the cyclopentadienyl rings. The B—N bond lengths of the BH3 protected amine is 1.631 (3) Å. The interplanar angle between the two connected cyclopentadienyl rings is 54.29 (8)° and the corresponding Fe—Cg—Cg—Fe torsion angle is −52.5°. The conformation of the molecule is stabilized by an intramolecular C—H...Br interaction.