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. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: Chem Sci. 2014 Jan;5(1):10.1039/C3SC52265B. doi: 10.1039/C3SC52265B

Table 2.

Counterion effects

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a

Determined by HPLC on commercial chiral columns.

b

Isolated yield after purification by chromatography on silica gel.

c

Determined by 1H NMR spectroscopic analysis of the crude reaction mixture relative to 2,5-dimethylfuran as the internal standard.

d

Range of enantiomeric excess achieved over >10 runs.