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New P,N ‐Chelate Ligands Based on Pyridyl‐Substituted Phosphaferrocenes
Author(s) -
Ganter Christian,
Glinsböckel Corinna,
Ganter Beate
Publication year - 1998
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199808)1998:8<1163::aid-ejic1163>3.0.co;2-p
Subject(s) - chemistry , chelation , combinatorial chemistry , stereochemistry , organic chemistry
The new pyridyl‐substituted phosphaferrocene ligands 3 and 6 are prepared by addition of lithiated pyridine or α‐picoline to 2‐formyl‐3,4‐dimethylphosphaferrocene ( 1 ). The ligands 3 and 6 react with [Cp*RuCl] 4 in THF to give the P,N ‐chelate complexes [Cp*RuCl· 3 ] ( 9 ) and [Cp*RuCl· 6 ] ( 10 ) with high diastereoselectivity. Addition of monodentate ligands like CO or PPh 3 to the complexes leads by displacement of the Ru‐bound pyridyl group to the respective carbonyl or phosphane complexes with monodentate P ‐coordinated phospha‐ferrocene ligands. Reaction of the ligand 6 with [(C 3 H 5 )PdCl] 2 and NH 4 PF 6 gives the seven‐membered chelate complex [(C 3 H 5 )Pd· 6 ]PF 6 ( 13 ) which was characterized by X‐ray diffraction. The ligands 3 and 6 were tested in the palladium‐catalyzed asymmetric alkylation of 1,3‐diphenylallyl acetate.