Transition metal complexes of bulky, electron-rich N-phosphanyl-substituted N-heterocyclic carbenes (NHCP ligands)

• Verfasst von: Nägele, Philipp [VerfasserIn]
• Verfasst von: Herrlich, Ulrike [VerfasserIn]
• Verfasst von: Rominger, Frank [VerfasserIn]
• Verfasst von: Hofmann, Peter [VerfasserIn]
• Titel: Transition metal complexes of bulky, electron-rich N-phosphanyl-substituted N-heterocyclic carbenes (NHCP ligands)
• Titelzusatz: small bite angle four-membered (κ-C,κ-P) chelate structures
• Verf.angabe: Philipp Nägele, Ulrike Herrlich (neé Blumbach), Frank Rominger and Peter Hofmann
• Jahr: 2013
• Umfang: 11 S.
• Fussnoten: Gesehen am 17.11.2021
• Titel Quelle: Enthalten in: Organometallics
• Ort Quelle: Washington, DC : ACS Publ., 1982
• Jahr Quelle: 2013
• Band/Heft Quelle: 32(2013), 1, Seite 181-191
• ISSN Quelle: 1520-6041
• DOI: doi:10.1021/om300963t
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1777643112

Abstract

Bulky, electron-rich N-phosphanyl-substituted N-heterocyclic carbenes (NHCP ligands: EtCNP 3, MesCNP 5a, DippCNP 5b) are potential ligands for strained, very small bite angle four-membered transition metal chelate complexes with (κ-C,κ-P) metal coordination. Various compounds of this type have been synthesized and were fully characterized inter alia by X-ray crystallography. Reactions of isolated NHCP species 3, 5a, and 5b with appropriate metal precursors furnished a series of (κ-C,κ-P)-coordinated four-membered NHCP chelate complexes for the metals of the nickel triad and for ruthenium. The cis-dimethyl Pd(II) complex (MesCNP-κC,κ-P)PdMe2 (8) reacted at room temperature with acceptor-substituted alkenes such as fumaronitrile and maleic anhydride to yield the corresponding η2-olefin complexes 9 and 10 with reductive elimination of ethane. Palladacyclopentadiene complex 11 was formed by addition of two equivalents of dimethyl acetylene dicarboxylate to complex 8 via alkyne-alkyne coupling.