title: Topological variations of the PDP ligand and its prospects in molybdenum(0) dearomatization agents.
abstract: The compounds fac-(κ(3)-PDP)Mo(CO)(3) {1; PDP = 2-[[2-(1-(pyridin-2-ylmethyl)pyrrolidin-2-yl)pyrrolidin-1-yl]methyl]pyridine}, [(cis-β-PDP)Mo(NO)(CO)]PF(6) ([cis-β-3]PF(6)), [(cis-α-PDP)Mo(NO)(CO)]PF(6) ([cis-α-3]PF(6)), [(cis-α-PDP)Mo(NO)Br]PF(6) ([4]PF(6)), [(trans-PDP)Cu](BF(4))(2)·CH(3)CN ([5](BF(4))(2)·CH(3)CN), and [(trans-PDP)Cu](OSO(2)CF(3))(2) ([5](OSO(2)CF(3))(2)) have been synthesized and structurally characterized by single-crystal X-ray diffraction. These are the first reported complexes of PDP on metal centers other than iron(II). The observed configurations indicate a broader range of accessible PDP topologies than has been reported. The {(cis-α-PDP)Mo(NO)}(+) fragment is found to be less π-basic than the dearomatizing {Tp(MeIm)Mo(NO)} fragment [Tp = hydridotris(1-pyrazolyl)borato; MeIm = 1-methylimidazole].
authors.affiliation: Department of Chemistry, Muhlenberg College, 2400 W. Chew Street, Allentown, Pennsylvania 18104, USA.
authors.forename: Benjamin K
authors.initials: BK
authors.lastname: Liebov
authors.forename: Caitlin E
authors.initials: CE
authors.lastname: Weigle
authors.forename: Kyle V
authors.initials: KV
authors.lastname: Keinath
authors.forename: Jennifer E
authors.initials: JE
authors.lastname: Leap
authors.forename: Robert D
authors.initials: RD
authors.lastname: Pike
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Keane