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trisoxazolines
Trisoxazolines (Often abbreviated TRISOX or TOX) are a class of tridentate, chiral ligands composed of three oxazoline rings. Despite being neutral they are able to form stable complexes with high oxidation state metals, such as rare earths, due to the chelate effect. The ligands have been investigated for molecular recognition and their complexes are used in asymmetric catalysts and polymerisation.
==Synthesis==
Trisoxazolines can either be synthesised directly, from suitable tripodal starting materials, or built up in a modular manner. These approaches can be used to give ligands of differing symmetries, with the direct synthesis route giving homochiral ligands with C3 rotational symmetry and the modular approach typically being used to give asymmetric compounds (C1 symmetry), which are either heterochiral or possess a mix of both chiral and achiral groups. These differences in symmetry can significantly effect the coordination chemistry of the ligands and the catalytic activity of their complexes, with C3 symmetric ligands often being better for asymmetric catalysis.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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