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Recent Comments
Interesting, and I agree that "atropisomer" does not describe this behavior, but how about planar chirality? This looks very much like the behavior you see in planar chiral cyclophanes, such as the chiral ligand Phanephos (https://en.wikipedia.org/wiki/Phanephos). We should not introduce new terms if there are existing terms that could be made to cover the new observations.
Thank you for your comment. This is a very good point and it was the similarity to chiral planarity, and specifically to chiral ansa-metallocenes, that inspired our suggestion of the term “ansamer”. If an accurate description of the isomers is possible with existing terminology, it would be preferable to use these existing terms. In this case, because the two amanitin isomers are not enantiomers, chiral planarity does not describe the behaviour accurately and we have to look for another term.