title: Selective formation of silver(i) bis-phospholane macrocycles and further evidence that gold(i) is smaller than silver(i).
abstract: A new synthetic approach to highly flexible bis-phospholanes from 1-benzylphospholane (1) as starting material is described. Silver(i) macrocycles containing 16 ([Ag2(μ-3a)2](BF4)2, 4), 20 ([Ag2(μ-3b)2](BF4)2, 5), 24 ([Ag2(μ-3c)2](BF4)2, 6), and 28 ([Ag2(μ-3d)2](BF4)2, 7) atoms in the ring were obtained in one step from AgBF4 and the respective bis-phospholane (C4H8P)(CH2)n(PC4H8) (n = 5, 7, 9, 11; 3a-d) in excellent yields. Comparison of 6 with the previously reported isomorphous complex [Au2(μ-3c)2](BF4)2 gave further evidence that gold(i) is significantly smaller than silver(i). All complexes were fully characterized by NMR and IR spectroscopy, mass spectrometry, and X-ray diffraction.
authors.affiliation: Institute of Inorganic Chemistry, Faculty of Chemistry and Mineralogy, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany. hey@uni-leipzig.de.
authors.forename: Markus
authors.initials: M
authors.lastname: Streitberger
authors.forename: Andy
authors.initials: A
authors.lastname: Schmied
authors.forename: Reinhard
authors.initials: R
authors.lastname: Hoy
authors.forename: Evamarie
authors.initials: E
authors.lastname: Hey-Hawkins