A rule to distinguish diastereomeric bianthrones by 1H NMR†
Abstract
Bianthrones have occurred widely in drug and material developments, but the stereochemistry remains in chaos so far due to the meso, racemic, and axis-rotating phenomena. Based on the computational and experimental results, an effective rule to distinguish between cis and trans bianthrones by 1H NMR is concluded, which applies to both homo- and heterobianthrones.