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Issue 36, 2018
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5-Methyl-2-thienylcalcium iodide

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The reduction of 2-bromo- and 3-bromothiophene with calcium powder gives impure thienylcalcium complexes due to interference of various subsequent metalation and calcium–halogen exchange reactions as well as ether degradation. Therefore, calcium–iodine exchange succeeds via the reaction of trimethylsilylmethylcalcium halide with 3-iodothiophene in tetrahydrofuran at −78 °C in the presence of chloro-trimethylsilane, leading to the quantitative formation of 3-(trimethylsilyl)thiophene. The synthesis and isolation of a thienylcalcium halide, a heavy Grignard reagent with a thienyl group, is possible via the reduction of 2-iodo-5-methylthiophene with activated calcium in THF. Substitution of the thf ligands in 5-methyl-2-thienylcalcium iodide ([5-MeThien-2-Ca(thf)4I], 1) by dissolution in tetrahydropyran (THP) leads to the thp complex of 5-methyl-2-thienylcalcium iodide ([5-MeThien-2-Ca(thp)4I], 2). A low field shift of the calcium-bound carbon atom is characteristic of thienylcalcium complexes.

Graphical abstract: 5-Methyl-2-thienylcalcium iodide

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Supplementary files

Article information

10 Apr 2018
24 Apr 2018
First published
25 Apr 2018

Dalton Trans., 2018,47, 12534-12539
Article type

5-Methyl-2-thienylcalcium iodide

A. Koch, S. Krieck, H. Görls and M. Westerhausen, Dalton Trans., 2018, 47, 12534
DOI: 10.1039/C8DT01398E

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