Title
Rapid determination of enantiomeric excess of a-chiral aldehydes using circular dichroism spectroscopy
Author
Sanmitra Barman, Eric V. Anslyn
Year
2014
Journal
Tetrahedron
Abstract
A method for enantiodiscrimination of α-chiral aldehydes is reported. The method utilizes circular dichroism (CD) spectroscopy and a sensing ensemble composed of 2-(1-methylhydrazinyl) pyridine (1) and Fe(II)(TfO)2. Aldehydes react rapidly with hydrazine (1) to form chiral imines, which form complexes with Fe(II). By monitoring the CD bands above 320 nm, one can determine the enantiomeric excess (ee) values of α-chiral aldehydes with an average absolute error of ±5%. The analysis was fast, and thus can have potential applications in high-throughput screening (HTS) of catalytic asymmetric induction.
Instrument
J-815
Keywords
Circular dichroism, Stereochemistry