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Chiral bis(mandelato)borate salts for resolution via metathesis crystallization.
Acta Crystallographica. Section C, Structural Chemistry 2017 August 2
Spiroborate anions have potential for crystallization or resolution and chiral bis(mandelato)borate anions can be used for the efficient resolution of a diverse range of racemic cations via diastereomeric salt formation. The syntheses, X-ray crystal structures and solubilities of three chiral bis(mandelato)borate salts, namely poly[[aqua-μ3 -bis[(R)-mandelato]borato-lithium(I)] monohydrate], [Li(C16 H12 BO6 )(H2 O)]n or Li[B(R-Man)2 ]·H2 O, (1), ammonium bis[(R)-mandelato]borate, NH4 + ·C16 H12 BO6 - or NH4 [B(R-Man)2 ], (2), and tetra-n-butylammonium bis[(R)-mandelato]borate, C16 H36 N+ ·C16 H12 BO6 - or NBu4 [B(R-Man)2 ], (3), are reported. They all have a BS configuration and show a reasonably well-conserved anion geometry. The main conformational variation is the orientation of the two phenyl groups, supporting the idea that [B(Man)2 ]- is a semi-rigid anion. The salts are differentially soluble in a range of solvents, meaning they could be useful as reagents for resolution via a metathesis crystallization approach.
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