title: Structurally versatile phosphine and amine donors constructed from N-heterocyclic olefin units.
abstract: A general strategy for the synthesis of hindered N- and P-based donors is presented whereby the strongly electron releasing N-heterocyclic olefin (NHO) unit, IPr[double bond, length as m-dash]CH-, (IPr[double bond, length as m-dash]CH- = [(HCNDipp)2C[double bond, length as m-dash]CH](-); Dipp = 3,6-(i)Pr2C6H2) is linked to terminally bound phosphine and amine donors. Preliminary coordination chemistry is presented involving phosphine (IPr[double bond, length as m-dash]CH)PR2 (R = (i)Pr and Ph) and amine (IPr[double bond, length as m-dash]CH)NMe2 ligands and the Lewis acids BH3 and AuCl. Interestingly, (IPr[double bond, length as m-dash]CH)NMe2 binds AuCl through an exocyclic olefin unit, while the softer phosphorus centers in (IPr[double bond, length as m-dash]CH)PR2 coordinate to yield Au-P linkages; thus the reported NHO-based ligands exhibit tunable binding modes to metals.
authors.affiliation: Department of Chemistry, University of Alberta 11227 Saskatchewan Drive, Edmonton, AB, T6G 2G2 Canada. erivard@ualberta.ca.
authors.forename: Nathan R
authors.initials: NR
authors.lastname: Paisley
authors.affiliation: Department of Chemistry, University of Alberta 11227 Saskatchewan Drive, Edmonton, AB, T6G 2G2 Canada. erivard@ualberta.ca.
authors.forename: Melanie W
authors.initials: MW
authors.lastname: Lui
authors.affiliation: Department of Chemistry, University of Alberta 11227 Saskatchewan Drive, Edmonton, AB, T6G 2G2 Canada. erivard@ualberta.ca.
authors.forename: Robert
authors.initials: R
authors.lastname: McDonald
authors.affiliation: Department of Chemistry, University of Alberta 11227 Saskatchewan Drive, Edmonton, AB, T6G 2G2 Canada. erivard@ualberta.ca.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Ferguson
authors.affiliation: Department of Chemistry, University of Alberta 11227 Saskatchewan Drive, Edmonton, AB, T6G 2G2 Canada. erivard@ualberta.ca.
authors.forename: Eric
authors.initials: E
authors.lastname: Rivard