A method was developed for one-pot synthesis of N,N,N',N'-tetramethylferrocene-1,1'-dicarbothioamide (H(2)fdt); ferrocene was lithiated with n-butyl lithium and then treated with N,N-dimethylthiocarbamoyl chloride. The structure of H(2)fdt was confirmed by X-ray analysis. The H(2)fdt molecule had a twofold axis and the two thioamide groups were nearly stacked. The twist angle of two cyclopentadienyl rings was 22.5(2)degrees. H(2)fdt was easily cyclopalladated with lithium tetrachloropalladate to give a mixture of isomers of the composition, Pd-2(fdt)Cl-2. The product reacted with bidentate ligands (L-L) to afford a mixture of meso and racemic isomers, Pd-2(fdt)(L-L)(2) (L-L=acetylacetonate, dipivaloylmethanate, N,N-diethyldithiocarbamate and N,N-diisopropyldithiocarbamate (pdc)ions). The mixtures were separated into the two isomers by chromatography on a silica-gel column and the racemic isomer of Pd-2(fdt)(pdc)(2) was identified by X-ray analysis. In the complex, one Pd coordination subunit was placed nearly upon the other and the twist angle of two cyclopentadienyl rings was 19.1(8)degrees.
<b>Highly Enantioselective Ferrocenyl Palladacycle-Acetate Catalysed Arylation of Aldimines and Ketimines with Arylboroxines</b>
importance. An attractive strategy is the arylation of imines with organoboronreagents. Chiral Rh complexes have reached a high level of productivity for this reaction type. In this article we describe that an electron rich PdII catalyst also performs well in the arylation of aldimines, comparable to the best Rh catalysts. The ferrocenyl palladacycle‐acetate catalyst allows for a broad substrate scope and
Macrocyclic Ferrocenyl–Bisimidazoline Palladacycle Dimers as Highly Active and Enantioselective Catalysts for the Aza-Claisen Rearrangement ofZ-ConfiguredN-para-Methoxyphenyl Trifluoroacetimidates