Enantiopure planar chiral monomers and di-µ-bromo-bridged dimers of ferrocenylhydrazones from asymmetric cyclopalladation
Abstract
Planar chiral cyclopalladated ferrocenylhydrozones [PdBr{(η5-C5H3CHNN(CH2)3CHCH2OCH3)Fe(η5-C5H5)}]
(–)-(Sp,R) and (+)-(Rp,S) and di-µ-bromo-bridged dimers [{Pd[(η5-C5H3C(CH3)NN(CH2)3CHCH2OCH3)-
Fe(η5-C5H5)](µ-Br)}2] syn-(–)-(Sp,R,R,Sp), syn-(+)-(Rp,R,R,Rp), syn-(+)-(Rp,S,S,Rp) and syn-(–)-(Sp,S,S,Sp) have been conveniently synthesized in enantiomerically pure form with a high level of diastereoselectivity and their absolute configurations elucidated by single-crystal X-ray analysis.