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Unformatted text preview: More examples of assigning the relationship between two molecules Instructions: Below is a fow chart to help you decide what the relationship is between two molecules. The possible answers are: a) not isomers, b) two diFFerent depictions oF the same molecule, c) constitutional isomers, d) diastereomers, and e) enantiomers. Do they have the same molecular formula? YES NO Not Isomers Isomers YES NO Constitutional Isomers Do they have the same connectivity? Stereoisomers NO Diastereomers Are they mirror images? Are the the same? YES NO Not isomers. They are the same Enantiomers YES Example 1: This is the same as the problem that was a problem in class. NH 2 OH NH 2 OH and compound 1 compound 2 Same molecular Formula? Same connectivity? Are they the same? Yes Yes Yes Comment: These two are the same molecules. If you pick up compound 1 and Fip it over (around the horizontal-axis), you get compound 2. Notice that when you Fip over the molecule the groups pointing up will point down and visa versa. ¡lip over compound 1 compound 1 = compound 2 NH 2 OH NH 2 OH Example 2: and compound 1 compound 2 Same molecular formula? Same connectivity? Are they the same? Are they mirror images? Yes Yes No No Comment: These molecules are diastereomers. They are not mirror images. We can try to test this by drawing the mirror image of compound 1. It would look like H 3 C OH CH 3 HO H 3 C OH mirror image of compound 1with mirror below (all chiral centers are Fipped) CH 3 HO mirror image of compound 1with mirror on the right....
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