title: An amidinate-stabilized germatrisilacyclobutadiene ylide.
abstract: The synthesis and characterization of new amidinate-stabilized germatrisilacyclobutadiene ylides [L(3)Si(3)GeL'] (L=PhC(NtBu)(2); L'=ËL; Ë=Ge (3), Si (7)) are described. Compound 3 was prepared by the reaction of [LSi-SiL] (1) with one equivalent of [LGe-GeL] (2) in THF. Compound 7 was synthesized by the reaction of 2 with excess 1 in THF. The bisamidinate germylene [L(2)Ge:] (4) is a by-product in both reactions. Moreover, compound 7 was prepared by the reaction of 3 with one equivalent of 1 in THF. Compounds 3 and 7 have been characterized by NMR spectroscopy, X-ray crystallography, and theoretical studies. The results show that compounds 3 and 7 are not antiaromatic. The puckered Si(3) Ge four-membered rings in 3 and 7 have a ylide structure, which is stabilized by amidinate ligands and the electron delocalization within the Si(3) Ge four-membered ring.
authors.affiliation: Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371.
authors.forename: Hui-Xian
authors.initials: HX
authors.lastname: Yeong
authors.forename: Shu-Hua
authors.initials: SH
authors.lastname: Zhang
authors.forename: Hong-Wei
authors.initials: HW
authors.lastname: Xi
authors.forename: Jing-Dong
authors.initials: JD
authors.lastname: Guo
authors.forename: Kok Hwa
authors.initials: KH
authors.lastname: Lim
authors.forename: Shigeru
authors.initials: S
authors.lastname: Nagase
authors.forename: Cheuk-Wai
authors.initials: CW
authors.lastname: So
mesh_terms: D018360:Crystallography, X-Ray; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; C573201:germatrisilacyclobutadiene