Branched Alkanes

Structural Formulas

Structural Isomers

Organic Chemistry

Table of ContentsLecture/Lab/Activity Date Pg#22. The Periodic Table 9/24/10 47

23. Periodic Def & Trends 9/27/10 4924. Electron config practice 10/4/10 5125. Ions and Oxidation Numbers 10/5/10 5326. Lewis Dot Diagram 10/6/10 5427. Intro to Chemical Bonding 10/7/10 5728. Covalent Bonding 10/12/10 6129. Ionic Bonding 10/14/10 6130. Ionic vs. Covalent Lab 10/18/10 6331. Metallic Bonding 10/19/10 6132. Molecular Geometry 10/21/10 6433. Writing Chemical Formulas 10/25/10 6734. Naming Ionic Compounds 10/26/10 6935. Ionic Compounds Puzzle 10/27/10 7136. Naming Molecular Compounds 10/29/10 7337.Acid Nomenclature 11/03/10 7538. Organic Chemistry – Alkanes 11/04/10 7739. Organic Chem–Alkenes&Alkynes 11/05/10 7940. Org Chem-Branched Alkanes 11/08/10 81

Objective:The student will record lecture notes on Hydrocarbons and document how to use the IUPAC nomenclature rules to name Alkanes

Agenda:Organic Chemistry– Lecture

Branches on carbon chainsH

H C CH3 methylHH H

H C C CH3CH2 ethylH H

Branched Alkanes

CH3 CH3CH CH3

methyl groups CH3 CH3 CH3CH CH2CHCH3

Branched Alkanes

CH3 methyl branchCH3CH2CH2CHCH2CH3

6 5 4 3 2 1 Count

Naming Branched Alkanes

3-Methylhexane

on third C CH3 six carbon chaingroup

1. Count the C’s in the longest chain

2. Name each attached group3. Count the longest carbon

chain to give the first attached group the smallest number

4. Name and locate each group

Naming Summary

CH3 CH3CH3CHCH2CHCH3

CH3 CH3CH3CH2CHCH2CHCH2CH3 CH3

Learning Check Alk4

2,4-dimethylpentane

3,3,5-trimethylheptane

Write a condensed structure for3,4-dimethylheptane

Learning Check Alk5

CH3CH3CH2CHCHCH2CH2CH3 CH3

Same molecular formulaSame number and types of atomsDifferent arrangement of atoms

Isomers

Write 3 isomers of C5H12 and name each.

CH3CH2CH2CH2CH3 pentane

CH3CHCH2CH3 2-methylbutane CH3 CH3CH3CCH3 2,2-dimethylpropane CH3

Learning Check Alk6