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Preferred Label : pseudo-asymmetric carbon atom;

IUPAC definition : The traditional name for a tetrahedrally coordinated carbon atom bonded to four different entities, two and only two of which have the same constitution but opposite chirality sense. The i r/s /i descriptors of pseudo-asymmetric carbon atoms are invariant on reflection in a mirror (i.e. i r /i remains i r /i , and i s /i remains i s /i ), but are reversed by the exchange of any two entities (i.e. i r /i becomes i s /i , and i s /i becomes i r /i ). An example is C-3 of ribaric (C-3 is i r /i ) or xylaric acid (C-3 is i s /i ) or hyoscyamine (C-3 is i r /i ). The hyphen in pseudo-asymmetric may be omitted.;

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The traditional name for a tetrahedrally coordinated carbon atom bonded to four different entities, two and only two of which have the same constitution but opposite chirality sense. The i r/s /i descriptors of pseudo-asymmetric carbon atoms are invariant on reflection in a mirror (i.e. i r /i remains i r /i , and i s /i remains i s /i ), but are reversed by the exchange of any two entities (i.e. i r /i becomes i s /i , and i s /i becomes i r /i ). An example is C-3 of ribaric (C-3 is i r /i ) or xylaric acid (C-3 is i s /i ) or hyoscyamine (C-3 is i r /i ). The hyphen in pseudo-asymmetric may be omitted.

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07/05/2025


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