Atropisomerism occurs when there is restricted rotation around a single bond due to steric hindrance or the presence of a chiral axis. In these compounds, the chiral axis is likely a bond between two atoms, and rotation about this bond interconverts the atropisomers.
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(Z)-[4-methyl-3-(2-methoxyphenyl)-1,3-thiazol-2(3H)-ylidene]-N-(2-methoxyphenyl)amine
Phosphine, (5,5'-dimethoxy-4,4',6,6'-tetramethyl[1,1'-biphenyl]-2,2'-diyl)bis[diphenyl- , (R)-
