CHEM 2211 1st Edition Lecture 9 Outline of Last Lecture I Test 1 review Outline of Current Lecture I Chapter 4 a Types of isomers Current Lecture Chapter 4 types of isomers Isomers Compounds with the same molecular formula but different structures Two main classes of isomers Constitutional isomers differ in the way their atoms are connected Examples CH3CH2OH and CH3OCH3 Ethanol dimethyl ether Stereoisomers differ in the way their atoms are arranged in space are the opposite of constitutional because the atoms are all connected in the same way Branches of stereoisomers Cis and trans These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Cis and trans isomers are the result of restricted rotation o restricted rotation can be caused by cyclic structure double bonds Cis isomers has its substituents on the same side of the ring or double bond trans isomers has its substituents on the opposite sides of the ring of double bond if you have a hard time with substituents look at the hydrogens cis isomers have the hydrogens on the same side of the ring or bond trans has the hydrogens on opposite sides of the ring or bond notes that the molecular formula and the bonds are all the same in cis and trans isomers just like in stereoisomers but it is the way their atoms orient in space that changes Conformations and configurations Conformations o are different spatial arrangements of the same compound Configurations o compounds with different configurations are different compounds o bonds have to be broken to interconvert compounds with different configurations
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