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Ch1b2010_Lecture3

Ch1b2010_Lecture3 - Revisiting Isomers Constitutional...

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Revisiting Isomers Constitutional isomers : molecules with the same molecular formula but different connectivity of atoms Geometrical isomers : molecules with the same molecular formula and same connectivity of atoms, which differ only in alkene geometry Stereoisomers : molecules with the same molecular formula and same connectivity of atoms, which differ only in the 3-dimensional orientation of their atoms in space enantiomers: two molecules that lack an internal mirror plane and are non-superimposable, mirror images. stereogenic carbon: a carbon that has 4 different substituents. meso compound: a molecule with an internal mirror plane.
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1. Identify whether the molecule has a stereogenic center (i.e. a carbon w/4 different substituents) 2. Assign a priority number to each substituent (1 = highest, 4 = lowest) 3. Rotate the lowest priority substituent to the back 4. Draw an arrow in the direction moving from highest to lowest priority number. Clockwise
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Ch1b2010_Lecture3 - Revisiting Isomers Constitutional...

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