CHMA10H3 Lecture Notes - Lecture 25: Optical Rotation, Carvone, Enantiomer

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19 Nov 2014
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CHMA10H3 Full Course Notes
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Chma10h3: introductory chemistry i: structure and bonding lecture 25: optical. Chirality at non-carbon centres: non-cases atoms can also be chirality centres. In rapidly in cases, where enantiomers can"t introvert, a pair of electrons can act as a substituent. Specific rotation: observed rotation when light of 586. 6nm wavelength is used with sample path length of 1dm and a sample concentration of 1g ml -1. Louis pasteur observed precipitation of two different kinds of crystals in tartaric acid salts: the initial mixture was not optically active. It was a 50:50 mixture of enantiomers (a racemate) Look at the four atoms directly attached to the stereo centre and assign priorities in order of decreasing atomic number. The atom with the highest atomic number is ranked first: multiple bonded atoms are equivalent to the same number of single bonded atoms. Enantiomers, diastereomers and meso stereoisomers: enantiomers have opposite configurations at all stereo centres, diastereomers are stereo metric molecules that are not mirror images.

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