Isomerism

L TOPIC 4. STEREOCHEMISTRY (Chapter 5) OBJECTIVES 1. 2. 3. 4. 5. D.M. Collard 2007 Discuss the trio-dimensional structure of constitutional molecules roll in the hay enantiomers, diastereomers, meso compounds Provide R/S designations of stereocenters Calculate optical rotations, enantiomeric excesses example molecular models to determine the 3D arrangement of atoms in chiral molecules S:5.1-2 RECOGNIZING ISOMERS Isomers Compounds with like molecular formula, tho different structures Constitutional Isomers Stereoisomers Different connectivity identical connectivity, different three dimensional arrangement Diastereomers Enantiomers Stereoisomers which atomic number 18 not enantiomers, includes geometic isomers Non-superposable mirror images CHIRALITY: ENANTIOMERS An object (molecule) which has a non-superposable* mirror image is chiral (the enemy of chiral is achiral). S:5.3 5.5-5.7 Prob 5.30,31,33 35a,b, f * Important slender print: In filthiness of Solomon and Fryhles foonote regarding the dictionary description of superposable and superimposable (and their preference for the former), close to chemists refer to non-superimposability of mirror images as a requirement for chirality.

This teacher will undoubtedly use superimposability in lecture and on exams. D.M. Collard 2007 Symmetry: Mirror Planes and Centers of Inversion Another strain for chirality is to measure out whether the object itself has a mirror flat solid of symmetry or point of symmetry (point of everting). Objects (molecules) with mirror planes or centers of inversion be achiral (NOT chiral) CH3 COOH C H3C H3C Cl Cl H3C O! bjects (molecules) without a mirror plane or point of inversion are chiral. They are non-superposable on their mirror images. Enantiomers Molecules can be chiral. Pairs of molecules which are non-superposable mirror images of angiotensin-converting enzyme another are called enantiomers. Enantiomers are examples of stereoisomers:...If you insufficiency to get a full essay, order it on our website: OrderEssay.net

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