Abnormal cyclopalladation of Schiff bases made of metallocenyl aldehydes and alpha-ferrocenylethylamine: Unexpected formation of the heteroannular 3-atomic bridge

作者：Troitskaya LL; Starikova ZA; Demeshchik TV; Ovseenko ST; Vorontsov EV; Sokolov VI^*

来源：Journal of Organometallic Chemistry, 2005, 690(17): 3976-3982.

DOI：10.1016/j.jorganchem.2005.05.035

• cyclopalladation
• ferrocenes
• ruthenocenes
• schiff bases
• aldimines
• X-ray analysis
• ansa-compounds
• heteroarmular bridged ferrocene
• NMR spectroscopy

Cyclopalladation of the Schiff bases of general formula McCH=N-CH(Me)Fc (Mc=Fc, Ru) (1a,b) with a chiral centre leads to the mixtures of three products, two of which (2 and 3) are planar chiral diastereomers formed from homoannular substitution into the aldehyde fragment. The third product 4 is a result of the unusual heteroannular palladation of the amine fragment in starting aldimine. This ansa-structure 4 having 3-atomic C-N-Pd bridge is without precedent in metallocenes. The molecular structures of all organopalladium compounds obtained have been proved using X-ray analysis of single crystals.

• 出版日期2005-9-1