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)}]

(–)-(S_p,R) and (+)-(R_p,S) and di-µ-bromo-bridged dimers [{Pd[(η⁵-C₅H₃C(CH₃)NN(CH₂)₃CHCH₂OCH₃)-

Fe(η⁵-C₅H₅)](µ-Br)}₂] syn-(–)-(S_p,R,R,S_p), syn-(+)-(R_p,R,R,R_p), syn-(+)-(R_p,S,S,R_p) and syn-(–)-(S_p,S,S,S_p) 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.