atropisomers

https://doi.org/10.1351/goldbook.A00511
A subclass of @C01262@ which can be isolated as separate @CT01038@ and which arise from @R05349@ about a single bond, e.g. ortho-substituted biphenyl, 1,1,2,2-tetra-tert-butylethane.
See:
rotational barrier
Source:
PAC, 1996, 68, 2193. (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2200 [Terms] [Paper]