Synthesis, crystal structure, and chirality of divalent lanthanide reagents containing tri- and tetraglyme |
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| Authors: | Marcus Vestergren Anna Johansson |
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| Affiliation: | a Department of Chemistry, Göteborg University, Kemivagen 10, SE-412 96 Göteborg, Sweden
b Department of Materials and Surface Chemistry, Chalmers University of Technology, SE-412 96 Göteborg, Sweden |
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| Abstract: | Six new divalent lanthanide complexes using triglyme (trigly) and tetraglyme (tetgly) as achiral ligands have been prepared, using a facile synthetic method, in search for enantioselective solid-state reagents. The crystal structures of cis-[SmI2(trigly)thf] (1), trans-[YbI2(trigly)thf] (2), trans-[SmI2(trigly)dme] (3), trans-[YbI2(tetgly)] (4), trans-[EuI2(tetgly)thf] (5), and [Sm(tetgly)2][SmI3(tetgly)]I (6) have been determined. All complexes, except 5, are chiral. The 10-coordinate cation in 6 displays a helical chirality since the two tetraglyme ligands are wrapped around the samarium ion. Since trans-[YbI2(tetgly)] (4), which has a chiral arrangement of terminal methyl groups, crystallizes as a conglomerate, preferential crystallization and consequent enantioselective reduction of acetophenone was attempted, but resulted in racemic products, possibly on account of racemic twinning in 4. |
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| Keywords: | Lanthanide Triglyme Tetraglyme Crystal structure |
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