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KMID : 1059520090530050530
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Journal of the Korean Chemical Society
2009 Volume.53 No. 5 p.530 ~ p.535
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Synthesis and Spectroscopic Investigations of Some New Organotelluronium Salts Based on Dicyclohexyl Telluride
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Ali Z. Al-Rubaie
Dhafir M. H. Al-Mudhaffar
Ali H. Al-Mowali
Kahtan A. Asker
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Abstract
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Dicyclohexyl telluride was obtained in a high yield by the reaction of cyclohexyl bromide with NaTeH(prepared in situ) in an aqueous ethanolic solution. A series of new organotelluronium salts of the general formula (cyclo-C6H11)2Te(R)X (where R = CH3, X = I (1); R = C2H5, X = Br(2); R = C2H5, X = I (3); R = C3H5, X = Br (4)) were prepared by the reaction of (cyclo-C6H11)2Te with the corresponding alkyl halide. Reaction of 1 with NaBPh4 gave compound 5 ( i.e. R = CH3, X = BPh4 ?) in 78% yield. Reaction of (cyclo-C6H11)2Te with benzyl bromide and 4-bromophenacyl bromide gave unexpectedly dibenzylcyclohexyltelluronium bromide (6) and bis(4-bromophenacyl)cyclohexyltelluronium bromide (7), respectively. Reaction of 6 with NaBPh4 gave the corresponding tetraphenylborate derivative (8) in high yield. 1H NMR studies revealed that in CDCl3solution compound 1 eliminated alkyl halide. Conductivity, IR, 1H and 13C NMR and thermal data for the new compounds are presented and discussed.
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KEYWORD
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Dicyclohexyl telluride, Telluronium salts, Reductive elimination, Oxidative addition, Tetraphenylborate
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