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1997 (1)
1993 (1)
1Author    WilliamS. Sheldrick, Thomas HäuslerRequires cookie*
 Title    Synthesis and Structure of the Hexaethylcyclohexaarsoxane Complexes [{M(CO)3}2{cjc/o-(C2H5AsO)6}], M = Cr, Mo, W  
 Abstract    The hexaethylcyclohexaarsoxane complexes [{M (CO)3}2{c>'c/o-(C2H 5A sO)6}], M = Cr, M o, W, 2 -4 have been prepared by the reaction o f (C2H 5AsO)n with the respective metal hexacar-bonyl in toluene and characterized by their IR and N M R spectroscopic data. For 2 the m olec­ ular structure was established by X-ray structural analysis. The 12 atom s o f the A s60 6 ring form a flattened cuboctahedron in which the 6 oxygen atoms lie in the central equatorial plane. Cr(CO)3 groups are coordinated facially by the upper and lower three arsenic atoms. An ap­ proximately S6 symmetry is displayed by the Cr2A s60 6 core. Average values o f respectively 116.3 and 98.9° are observed for the A s -O -A s and O -A s -O angles in the hexadentate li­ gand. The E l-M S and 'H N M R data for (C2H 5AsO)" suggest that this alkylcycloarsoxane is present in solution as a mixture o f species including trimers and tetramers so that a metal as­ sisted ring expansion is required for the formation o f 2 -4 . 
  Reference    Z. Naturforsch. 48b, 1069—1074 (1993); received April 5 1993 
  Published    1993 
  Keywords    Ethylcycloarsoxane, Tricarbonyl Metal Complexes, Crystal Structure 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1069.pdf 
 Identifier    ZNB-1993-48b-1069 
 Volume    48 
2Author    Thom As Häusler, W. Illiam, S. SheldrickRequires cookie*
 Title    Metal-Mediated Assembly of Hexameric Ethylcycloarsoxane (C2H5AsO)6 in Mono-and Dinuclear Complexes with Tetrahedral and Octahedral Coordination Spheres  
 Abstract    A metal-assisted ring expansion from the preferred solution species (EtAsO),,, n = 3,4, to the hexameric ligand (EtAsO)6 is observed for the reactions of [ReBr(CO)5], [RuCLCPh^P)?], RhCfv3 H2 0 and [C^CCF.^SO.OaCCftHft)] with ethylcycloarsoxane. Whereas two metal frag­ ments are facially coordinated by the upper and lower three As atoms of a flattened AsftOö cuboctahedron in both [{ReBr(CO)2} 2 {M-[cyc/o-(EtAsO)6]}] (1) and [Cu2{n-[cyclo-(EtAs0)6]}(Me2PhP)2](CF3S03)2 (4), potential ring strain restricts the reaction with the other compounds to the formation of mononuclear complexes [RuCl2{cvc/o-(EtAsO)6}(Ph3P)] (2) 
  Reference    Z. Naturforsch. 52b, 679—686 (1997); received March 6 1997 
  Published    1997 
  Keywords    Ethylcycloarsoxane, Transition Metal Complexes, Metal-Mediation, Ring Expansion 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0679.pdf 
 Identifier    ZNB-1997-52b-0679 
 Volume    52