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CAS CH 102 (93)
Lecture

Chapter 13 Elliott

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Department
Chemistry
Course
CAS CH 102
Professor
Sean Elliott
Semester
Spring

Description
• Homologous series: related compounds that differ by the number of subgroups  per molecule o Methylene group (–CH –) 2  Methyl group (–CH )3 • Naming Alkanes: 1. Find the longest continuous chain of carbon atoms  to assign the parent name. 2. Find whatever groups are not a part of the longest continuous chain. Name  these as prefixes. 3. Assign numbers to the groups by counting from one end  of the chain. A chain has two ends so start with the end closest to the  groups. 4. If there are two or more identical groups, use prefixes to designate the  number: di­ (2), tri­ (3), tetra­ (4), penta­ (5), etc. 5. If there are two or more different groups, write them in the prefix in  alphabetical order. • Stereoisomerism: o Stereoisomers − molecules with the same connectivity, but the same  bonds are oriented differently atoms in different positions (orientation  different). o Stereoisomerism due to restricted rotation about is called cis ­ trans  isomerism o A cis isomer (or Z isomer) has two like groups on the same side of a line  drawn through a double bond (chain moves from up 
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