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==Quasi-enantiomers== ''Quasi''-enantiomers are molecular species that are not strictly enantiomers, but behave as if they were. In quasi-enantiomers, the majority of the molecule is reflected; however, an atom or group within the molecule is changed to a similar atom or group.<ref name=":1">{{Cite journal |last1=Zhang |first1=Qisheng |last2=Rivkin |first2=Alexey |last3=Curran |first3=Dennis P. |date=2002-05-01 |title=Quasiracemic Synthesis: Concepts and Implementation with a Fluorous Tagging Strategy to Make Both Enantiomers of Pyridovericin and Mappicine |url=https://pubs.acs.org/doi/10.1021/ja025606x |journal=Journal of the American Chemical Society |language=en |volume=124 |issue=20 |pages=5774–5781 |doi=10.1021/ja025606x |pmid=12010052 |bibcode=2002JAChS.124.5774Z |issn=0002-7863}}</ref> Quasi-enantiomers can also be defined as molecules that have the potential to become enantiomers if an atom or group in the molecule were replaced.<ref>{{Cite journal |last1=Zhang |first1=Qisheng |last2=Curran |first2=Dennis P. |date=2005-08-19 |title=Quasienantiomers and Quasiracemates: New Tools for Identification, Analysis, Separation, and Synthesis of Enantiomers |url=https://onlinelibrary.wiley.com/doi/10.1002/chem.200500076 |journal=Chemistry - A European Journal |language=en |volume=11 |issue=17 |pages=4866–4880 |doi=10.1002/chem.200500076 |pmid=15915521 |issn=0947-6539}}</ref> An example of quasi-enantiomers is (''S'')-bromobutane and (''R'')-iodobutane. Under normal conditions, the enantiomers for (''S'')-bromobutane and (''R'')-iodobutane are (''R)-''bromobutane and (''S'')-iodobutane respectively. Quasi-enantiomers also produce quasi-racemates, which are similar to normal racemates (see [[Racemic mixture]]) in that they form an equal mixture of quasi-enantiomers.<ref name=":1" /> Though not considered actual enantiomers, the naming convention for quasi-enantiomers also follows the same trend as enantiomers, when looking at (''R'') and (''S'') configurations - which are considered from a geometrical basis (see [[Cahn–Ingold–Prelog priority rules]]). Quasi-enantiomers have applications in parallel [[kinetic resolution]].<ref>G.S. Coumbarides, M. Dingjan, J. Eames, A. Flinn, J. Northen and Y. Yohannes, Tetrahedron Lett. 46 (2005), p. 2897er</ref>
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