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  CXYA B Relation  between X & Y TOPICITY ByDr. G. KrishnaswamyFacultyDOS & R in Organic ChemistryTumkur UniversityTumakuru Bottom faceTop face 10/6/2019 1  Earlier part of stereochemistry was concentrated on the stereocenter.(TOPOs in Greek means place) CXYA B Stereo center  * CXYA B Relation  between X & Y Now we start to see the relationship between the ligandsattached to stereo center if the attached ligands arehomomorphic in nature. 10/6/2019 2  Homomorphic Groups / Ligands / Atoms The Groups / ligands / atoms which are in isolation look thesame or super imposable mirror images of each other arecalled homomorphic groups / ligands / atoms. CCH 3 CH 3 H H Homomorphic groupsHomomorphic atoms Homo in greek means sameMorph in greek means form 10/6/2019 3  In case of  atoms, they must be of same element example two H’s  or two Br atoms. CCH 3 CH 3 HHH H IsolatedIsolated Identical and super imposable If we isolate the two  H’s,  then they are same and superimposable to each other hence they are called homomorphichydrogen's. 10/6/2019 4

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