- Halogen exchange reaction of optically pure halotelluranes
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A series of optically pure chlorotelluranes (2a-c) has been prepared by using the 2-exo-hydroxy-10-bornyl group as a chiral ligand. Fluoro, bromo, and iodotelluranes (1,3, and 4) were also prepared by the halogen exchange reaction of 2 in the presence of NaX, AgX, or tetrabutylammonium halide (TBAX) (X = halogen). The retention of the stereochemistry of chiral tellurium atom was observed throughout the reaction. An SN1 pathway was proposed as the mechanism of this halogen exchange reaction.
- Takahashi, Shigemasa,Zhang, Jian,Saito, Shinichi,Koizumi, Toru
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p. 373 - 384
(2007/10/03)
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- First synthesis and structure of optically pure Te-chiral-alkoxytelluranes
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The first synthesis and isolation of optically pure Te-chiral-alkoxytelluranes 1 and 8 have been developed using the 2-exo-hydroxy-10-bornyl group as a chiral ligand. A distorted trigonal bipyramidal (TBP) structure of 1i with R configuration was confirmed by the X-ray analysis.
- Takahashi, Tamiko,Zhang, Jian,Kurose, Noriyuki,Takahashi, Shigemasa,Koizumi, Toru,Shiro, Motoo
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p. 2797 - 2800
(2007/10/03)
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