Schwan, Karl-Christian and Adolf, Ariane and Vogel, Ulf and Thoms, Christine and Zabel, Manfred and Timoshkin, Alexey Y. and Scheer, Manfred (2008) Selective halogenation at the pnictogen atom in Lewis-acid/base-stabilised phosphanylboranes and arsanylboranes. Dalton Transactions 2008 (31), pp. 5054-5058.
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The halogenation of Lewis-acid/base-stabilised phosphanylboranes ( 1a) and arsanylboranes ( 1b) with CX4 (X = Cl, Br) leads selectively to the substitution of both protons at the pentel atom and the new compounds [(CO)5W(X2PBH2·NMe3)] ( 2a: X = Cl, 2b: X = Br) and [(CO)5W(X2AsBH2·NMe3)] ( 3a: X = Cl, 3b: X = Br), respectively, are obtained. The new products were comprehensively characterised by spectroscopic methods and by X-ray crystallography. While compounds 2a and 2b show an antiperiplanar arrangement of the Lewis acid (W(CO)5) and the Lewis base (NMe3) in the solid state, a synclinal arrangement in 3a and 3b, respectively, was observed. Computational calculations of the optimised antiperiplanar and synclinal geometries of the compounds 2 and 3 in the gas phase slightly favour the antiperiplanar arrangement of the Lewis acid and the Lewis base for both compounds.
|Date:||6 August 2008|
|Institutions:||Chemistry and Pharmacy > Institut für Anorganische Chemie > Chair Prof. Dr. Manfred Scheer|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||07 Jun 2010 12:20|
|Last Modified:||20 Jul 2011 22:29|