Mononuclear tantalum (V) pentalene complexes: synthesis of [Ta n8-C8H4(1,4-SiiPr3)2 X3] (X = CH3, Cl, I) and the X-ray crystal structures of [Ta n8-C8H4(1,4-SiiPr3)2 (CH3)3], [Ta n8-C8H4(1,4-SiiPr3)2 (CH3)2Cl], [Ta n8-C8H4(1,4-SiiPr3)2 (CH3)Cl2] and [Ta n8-C8H4(1,4-SiiPr3)2 I3]

Cloke, Geoff, Hitchcock, Peter, Morley-Smith, Neil and Kuchta, MC (2004) Mononuclear tantalum (V) pentalene complexes: synthesis of [Ta n8-C8H4(1,4-SiiPr3)2 X3] (X = CH3, Cl, I) and the X-ray crystal structures of [Ta n8-C8H4(1,4-SiiPr3)2 (CH3)3], [Ta n8-C8H4(1,4-SiiPr3)2 (CH3)2Cl], [Ta n8-C8H4(1,4-SiiPr3)2 (CH3)Cl2] and [Ta n8-C8H4(1,4-SiiPr3)2 I3]. Polyhedron, 23 (17). pp. 2625-2630. ISSN 02775387

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Abstract

The reaction between [TaMe3Cl2] and the potassium salt of the silylated pentalene dianion [K2{C8H 4(1,4-SiiPr3)2}] gives the ¿8-pentalene complex [Ta{¿8-C8H 4(1,4-SiiPr3)2}(CH3) 3]. The reaction between [TaMe3Cl2] and the potassium salt of the silylated pentalene dianion [K2{C 8H4(1,4-SiiPr3)2}] gives the ¿8-pentalene complex [Ta{¿8-C 8H4(1,4-SiiPr3)2}(CH 3)3] (1). Sequential protonolysis of 1 with [Et 3NH]Cl affords [Ta{¿8-C8H 4(1,4-SiiPr3)2}(CH3) 2Cl] (2), [Ta{¿8-C8H4(1,4- SiiPr3)2}(CH3)Cl2] (3) and [Ta{¿8-C8H4(1,4-SiiPr 3)2}Cl3] (4). An alternative and cleaner route to 4 involves treatment of 1 with BCl3; in an analogous fashion, the reaction of 1 with BI3 gives [Ta{¿8-C 8H4(1,4-SiiPr3)2}I 3] (5). The X-ray crystal structures of 1, 2, 3 and 5 are reported.

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Depositing User: Geoff Cloke
Date Deposited: 06 Feb 2012 21:13
Last Modified: 06 Feb 2012 22:06
URI: http://sro.sussex.ac.uk/id/eprint/30336
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