Bidentate Chelates with Larger Spacers

Bidentate Chelates with Larger Spacers

Author: European Journal of Inorganic Chemistry

Chelating Lewis acids with a geminal arrangement of two acceptor functions have been shown to effectively coordinate halide, thiolate, or benzoate anions. However, the acceptor atoms usually occupy geminal positions at a bridging carbon atom, which results in relatively strained four-membered heterocycles upon coordination of single-atom donors.

Werner Uhl and colleagues, University of Münster, Germany, employed the twofold hydroalumination of silicon-centered dialkynes to prepare compounds that have larger spacers between the acceptor functions. This allows more flexible backbones and hence better coordinating properties. A compound prepared in this way was shown to chelate chloride ions to give a six-membered ClAl2C2Si heterocycle (pictured).

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