CHEM 2750 Week 3 Notes
CHEM 2750 Week 3 Notes Chem 2750
Popular in Organic Chemistry I
Popular in Chemistry
This 3 page Class Notes was uploaded by Tyler Ebeling on Monday February 8, 2016. The Class Notes belongs to Chem 2750 at East Carolina University taught by Shouquan Huo in Fall 2016. Since its upload, it has received 88 views. For similar materials see Organic Chemistry I in Chemistry at East Carolina University.
Reviews for CHEM 2750 Week 3 Notes
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 02/08/16
Organic Chemistry Week 3 Notes There are two types of conformations (Also known as Newman Projections): Staggered and eclipsed. Staggered is more stable than eclipsed. This is because they are on completely opposite sides of the molecule, so they counteract each other’s charge and stabilize the molecule. Eclipsed is less stable, and is when the bonds line up parallel to each other (Even though they appear to be slightly misaligned, they are actually perfectly parallel with eachother). Conformations fo cyclohexane -Cyclohexane has an ideal energy of 0, so is the most common molecule that we will be working with this semester. -The “chair” conformation is free of strain, and is the lowest energy conformation of hexane. “Cis” and “Trans” isomers -The “trans” isomer is the result when two substituents point in opposite directions. -The “cis” isomer is the result when two substituents point in the same direction. Axial position: up/down Equatorial position: Left/right A larger substituent molecule (Substituent = a molecule coming off of the “parent” molecule) almost always goes in equatorial position, because that is the most energy efficient (lowest) conformation. (If it were to go in axial position, it’s molecules would be too close to the molecules of the parent molecule, and the charges would repel each other). Chapter 4: Isomers Isomers: non-identical compounds having the same molecular formula. Chirality -Achiral objects have superimposable mirror images (One half of the molecule is a perfect mirror image of the other half). -Chiral objects have non superimposable mirror images (e.g. your hands) Asymmetric center: This is the cause of chirality in a molecule. An sp3 carbon bonded to 4 different groups is an asymmetric center. Stereocenter: an atom at which the interchange of two groups produces a stereoisomer (more general than an asymmetric center). Changing bonds at a stereo center changes “cis” to “trans” (only if the two groups are different e.g. ethyl and methyl. ) Also note, every asymmetrical center is also a stereocenter, but not every stereocenter is an asymmetrical center.
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'