stereochemistry

stereochemistry - Chapter 7, Stereochemistry Stereo...

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Chapter 7, Stereochemistry 1 Stereo chemistry is the branch of chemistry concerned with the three dimensional aspects of molecules. Isomers: Constitutional Isomers have same formula but different connections between atoms.They have different physical and chemical properties Example: Pentane (C 5 H 12 ) has three isomers: n-Pentane Isopentane Neopentane Stereo Isomers , they have same formula and same connection between atoms, but differ in the arrangement of atoms in the space, like cis and trans isomers in alkenes. Trans isomer Cis isomer In this chapter we will learn another type of stereoisomerism, Mirror Image Stereoisomerism. Chiral carbon : If a tetrahedral carbon is connected to 4 different groups, it’s called chiral carbon, this molecule has stereocenter . The mirror image of a chiral molecule is not same with the original molecule, they are nonsuperimposable . Achiral molecule : If a molecule and its mirror image are same it’s called achiral molecule. Achiral molecule and its mirror image are superimposable .A molecule with a plane of symmetry is achiral even if it has a chiral carbon. Identifying Chiral and Achiral compounds ; optical activity and specific rotation: Chiral molecules are able to rotate plane polarized light, they are optically active. Achiral molecules are not optically active.
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This note was uploaded on 07/20/2009 for the course CHEM chem taught by Professor Nakamoto during the Summer '09 term at UCLA.

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stereochemistry - Chapter 7, Stereochemistry Stereo...

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