952488-07-2Relevant academic research and scientific papers
Conformational changes and anion-cation interactions in palladium-cyclometalated BINAP and chiraphos cationic complexes. A structural study via NMR and X-ray methods
Nama, Devendrababu,Butti, Pietro,Pregosin, Paul S.
, p. 4942 - 4954 (2008/10/09)
The cyclometalated Pd complexes [Pd{(A or B)C6H 3CH=N(p-CH3C6H4)}(BINAP)](X) (8-13; X = PF6-, BArF, CF3SO3-, A, B = meta or para ring substituent), [Pd{(C6H4CH(CH3)N(CH 3)2)}{(S)- or (R)-BINAP))KCF3SO3) (14a,b), and [Pd{(C6H4CH(CH3)N(CH 3)2)}{(S,S)- or (R,R)-Chiraphos)}](CF3SO 3) (15a,b) have been prepared, and five of these have been studied by X-ray diffraction. NMR Overhauser measurements reveal that the chiral cyclometalated amine chelate senses the change in the chirality, for both the BINAP and the Chiraphos auxiliaries, and responds by a conformational adjustment of the ring. 1H, 19F-HOESY data for both 14 and 15 suggest differences between the diastereomers 14a,b (and 15a,b). PGSE diffusion data for these salts are reported.
