Isomerism

L TOPIC 4. STEREOCHEMISTRY (Chapter 5) OBJECTIVES 1. 2. 3. 4. 5. D.M. Collard 2007 Discuss the tierce-dimensional structure of organic fertiliser 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, yet different structures Constitutional Isomers Stereoisomers Different connectivity identical connectivity, different three dimensional arrangement Diastereomers Enantiomers Stereoisomers which atomic number 18 non enantiomers, includes geometic isomers Non-superposable mirror images CHIRALITY: ENANTIOMERS An object (molecule) which has a non-superposable* mirror image is chiral (the blow of chiral is achiral). S:5.3 5.5-5.7 Prob 5.30,31,33 35a,b,f * Important slender print: In acrimony of Solomon and Fryhles foonote regarding the dictionary description of superposable and superimposable (and their preference for the former), just about 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 quantify whether the object itself has a mirror even of symmetry or point of symmetry (point of everting). Objects (molecules) with mirror planes or centers of inversion ar achiral (NOT chiral) CH3 CO OH C H3C H3C Cl Cl H3C Obje! cts (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 genius another are called enantiomers. Enantiomers are examples of stereoisomers:...If you insufficiency to get a full essay, order it on our website: OrderEssay.net

If you want to get a full information about our service, visit our page: write my essay