Investigating Chemical Properties Of When The Molecule

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CH 220C
Michael Wood
Experiment 3: Stereochemistry This lab consisted of formulating a mechanism by which dimethyl maleate (cis confirmation) could be isomerized to dimethyl fumarate (trans confirmation) by heat, light, or bromine. In order to investigate chemical properties of when the molecule is in a chiral vs. achiral environment, enantiomers of carvones were compared. Enantiomers and diastereomers are the two classes of stereoisomers. Stereoisomers are molecules that have the same chemical formula, but differ in their three-dimensional arrangement in space. Enantiomers are mirror images of each other that are non-superimposable. In an achiral enviroment, they do not rotate plane-polarized light with the same ability, but they exhibit the same physical and chemical properties. In a chiral enviroment, enantiomers show different reactions with other molecules. The configuration of the enantiomer is what determines the direction that it will rotate light. Light will either be rotated to the left or to the right. Most enantiomers produced in a lab have a value of zero as their net rotation of plane polarized light value and end up being in a 50:50 racemic mixture. Diasteromers are when two molecules have equivalent stereocenters, but are not mirror images of each other. The molecules have different chemical and physical properties. The S (+)-Caravone and the R(-)-Caravone enantiomers were used in the first part

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