title: Non-symmetric diphosphines based on the imidazole scaffold: an unusual group interchange involving Pd-CH3 and (imidazole)P-Ph cleavage.
abstract: Two regioisomeric, non-symmetric P(C2)P(N)-imidazoles, t-Bu2PNCH=CHNC(PPh2) (L1, P(C2) = PPh2, P(N) = P(t-Bu)2) and Ph2PNCH=CHNC[P(t-Bu)2] (L2, P(C2) = P(t-Bu)2, P(N) = PPh2), respectively, show dramatic differences in the reactivity of the N-bound phosphine group; the L2 isomer is extremely sensitive to P-N bond cleavage by nucleophiles, and when coordinated to the PdCl(Me) fragment it undergoes facile interchange of one P(N) phenyl with the methyl originating from Pd.
authors.affiliation: Laboratoire de Chimie de Coordination, Institut de Chimie (UMR 7177 CNRS), Université de Strasbourg, 4 rue Blaise Pascal, 67081 Strasbourg Cedex, France. danopoulos@unistra.fr braunstein@unistra.fr.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Ai
authors.forename: Andreas A
authors.initials: AA
authors.lastname: Danopoulos
authors.forename: Pierre
authors.initials: P
authors.lastname: Braunstein