Reaction of [Et4N]2[TeCr(CO)5} n] (n = 2, 3) toward electrophiles: Reactivity comparison and theoretical calculations

Minghuey Shieh, Li Fang Ho, Pei Chi Chen, Miao Hsing Hsu, Hui Lung Chen, Yu Wen Guo, Yi Wen Pan, Yi Chun Lin

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Abstract

Reactions of [Et4N]2[Te(Cr(CO)5} n] (n = 2, 3) with a series of organic and inorganic electrophiles have been systematically studied and compared. When [Et4N] 2[Te{Cr(CO)5)2] was protonated with ~1.0 equiv of HBF4 in MeCN, the monohydrido Te-Cr complex [Et 4N][HTe{Cr(CO)5)2] ([Et4N][1]) was obtained. However, similar protonation of [Et4N] 2[Te{Cr(CO)5}3] led to the formation of the decomposition product [Et4N]2[Te2(Cr(CO) 5}4]. While methylation of [Et4N] 2[Te{Cr(CO)5}2] with CF3SO 3Me formed mono- and dimethylated products [Et4N] [MeTe{Cr(CO)5}2] and Me2Te{Cr(CO) 5}2 (2) stepwise, a similar reaction with [Et 4N]2[Te{Cr(CO)5}3] produced the monomethylated product [Et4N][MeTe{Cr(CO)5}3] (3). Further, when [Et4N]2[Te{Cr(CO)5}n] (n = 2, 3) was stirred in CH2Cl2 at 0°C, the Cl-functionalized products [Et4N][ClH2CTe{Cr(CO) 5}n] (n = 2, [Et4N][4]; n = 3, [Et 4N][5]) were produced, respectively. Similar reactions with CH 2Cl2 at room temperature produced corresponding CH 2-bridged dimeric products [Et4N]2[CH 2Te2{Cr(CO)5}n] (n = 4; 6, [Et 4N]2[6]). If the bisbenzyl-containing reagent ClH 2C(C6H4)2-CH2Cl reacted with [Et4N]2[Te{Cr(CO)5}n] (n = 2, 3), the corresponding CH2(C6H4) 2CH2-bridged dimeric complexes [Et4N] 2[H2C(C6H4)2CH 2Te2{Cr(CO)5}n] (n = 4, [Et 4N]2[7]; n = 6, [Et4N]2[8]) were produced. [Et4N]2[Te{Cr(CO)5}n] (n = 2, 3) could further react with HgCl2 in THF to give corresponding Hg-bridged products [Et4N]2[HgTe2{Cr(CO) 5)n] (n = 4, [Et4N]2[9]; n = 6, [Et4N]2[10]). Complex 9 was found to transform to complex 10 upon its reaction with HgCl2 in THF. Interestingly, the novel O2-activation product [Et4N][OTe{Cr(CO)5} 2] ([Et4N][11]) was observed when [Et4N] 2[Te{Cr(CO)5}2] was bubbled with O2 in MeCN. Complexes 1-11 were fully characterized by elemental analysis, spectroscopic methods, and/or single-crystal X-ray analysis. The nature of [Te{Cr(CO)5}n]2- (n = 2, 3) and the resultant complexes were further investigated by molecular orbital calculations at the B 3LYP level of the density functional theory.

Original languageEnglish
Pages (from-to)6184-6196
Number of pages13
JournalOrganometallics
Volume26
Issue number25
DOIs
Publication statusPublished - 2007 Dec 3

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

Cite this

Shieh, M., Ho, L. F., Chen, P. C., Hsu, M. H., Chen, H. L., Guo, Y. W., Pan, Y. W., & Lin, Y. C. (2007). Reaction of [Et4N]2[TeCr(CO)5} n] (n = 2, 3) toward electrophiles: Reactivity comparison and theoretical calculations. Organometallics, 26(25), 6184-6196. https://doi.org/10.1021/om700789a