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Skeletal Isomers
- 1) Same Molecular Formula
- 2) Same Family
- 3) Different arrangements
- * Use the 'Stand on Carbon' to determine- will have the same amount of primaires, etc.
- * Can have different names, just has to have the same amount of C and H
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Positional Isomer
- 1) Same Molecular Formula
- 2) Same Family
- 3) Position of Side Group varies
* Can have different names, just has to have the same amount of C and H
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Functional Isomer
- 1) Same Molecular Formula
- 2) Different Family
*Pay attention ot location of O and other elements
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C2H5-O-C4H9
Example of non-symetrical Ether
* When naming, the side group is the smaller side (C2H5)
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CH3-O-CH3
Example of Symetrical Ether
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Conformational Isomers
- 1) Rotation around C-C Bond
- 2) Bond is not broken (i.e. Chair/ Boat)
- *Optical Stereoisomers (Newman Projections), Chair/ Boat
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Configurational Isomers
1) Bonds must be broken
- *Geometric Stereoisomers, Cis/ Trans, E-Z
- * Enantiomers, Diastereomers, Meso Compounds
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Chiral Carbon
- 1) Must have 4 Different groups attached
- * On a model, it would have 4 different Colors
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Enantiomer
- 1) Must have at eleast 1 chirocarbon
- 2) Mirror Image
- 3) Molecules will not line up ** Like Hands***
- 4) All molecules will have the same BP, MP, Reactin time, etc.
- 5) Molecules rotate in different directions
- 6) Cannot be seperated at all
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Optically Active
That which has Chiro Carbon
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Diastereomers
- 1) Chiral Carbons
- 2) No Mirror Images
- 3) All information is different (BP, MP, etc.)
- 4) Can be seperated by chemical means
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Meso Compounds
- 1) Even Amount of Chiral Carbons
- 2) Mirror Images
- 3) Internal Symmetry (divide molecule in half for mirror image)
- 4) Optically INACTIVE
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Which is Optically Active?
Question asking to identify Chiral Carbon
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R/S Designation
- 1) Identify lowest priority group
- a) If group is on vertical 'erase' and proceed
- b) If group is on horizontal, 'erase' and swap with horizontal counterpart
- 2) Determine remaining priorities on cross and number based on atomic #
- 3) Draw rotational arrow to determine direction
- *In the result of a tie- determine which has higher subsitution
- ** If more than one ChiralCarbon, be sure to indicate which # carbon is S or R
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