Drill: Give the molecular formula & the condensed, skeletal, and complete structures of a hydrocarbon with the same # of carbons as the # of letters in your first name.

Branched Alkanes

Any hydrogen in a hydrocarbon chain can be substituted with another hydrocarbon group

H H H H-C-C-C-H H H H propane

H H H H-C-C-C-H H CH 3 H _____ propane

Substituents The name for the hydrocarbon group that replaced the hydrogen

Substituents The substituted hydrocarbon group is called an alkyl group Suffix: -yl: hydrocarbon group

Branched Chains When an alkane chain gets another hydrocarbon group substituted onto it Branches: sidechains

Branched Chains C C C C C C C C C C

Naming Branched Chains

Drill: Name Each: H 3 C-CH 2 -CH 3 C-C-C-C-C

1) Find the longest continuous carbon chain & name it as the main chain. The final name will end with the naming of the main chain

CHexane C C C

2) Number each carbon in the chain; so that, the side chains will be connected to the lowest possible numbers on the carbons

CHexane C 1 C 2 C 3 C 4 C 5 C 6 C C C

3) Name the side chains or substituted groups, & precede them with the # of the carbon they are connected to & a dash

C 2-methyl C 1 C 2 C 3 C 4 C 5 C 6 C C C 2-methyl 4-ethyl

4) If identical groups appear more than once, use prefixes: di for 2, tri for 3, tetra for 4, penta for 5, etc Examples: dimethyl, tripropyl, etc

C 2,2-dimethyl C 1 C 2 C 3 C 4 C 5 C 6 C C C 4-ethyl

5) Name the sidechains or groups in alphabetical order, but ignore the prefixes when doing so ·Examples: ethyl comes before dimethyl, e < m

6) Separate numbers with commas, use hyphens between words & numbers, and write the alkanes as one word ·Example: dimethylhexane

C C C C 4-ethyl-2,2-dimethylhexane

ORG HW Draw both skeletal & condensed structures for an 8-carbon chain with 1- carbon & 2-carbon branches and name it.

Name the organic compound on the board

Drill: Name CH 3 CH 2 H 3 C-CH-CH 2 -CH-CH-CH 3 CH 3 CH 2 CH 3

4-ethyl-2,5- dimethylheptane CH 3 CH 2 H 3 C-CH-CH 2 -CH-CH-CH 3 CH 3 CH 2 CH 3

Name the organic compound on the board

Deriving Structures from Names Draw the main chain first –Look to the name ending Draw the branches –Look to the # & group name

Draw: 3,4-diethyl-2-methyloctane 2,3,5-trimethylhexane 5-butyl-3-ethyl-2,6,8- trimethyl-4-propyldecane

Drill: Draw: 5-butyl-3-ethyl- 2,6,8,9-tetramethyl- 4,7-dipropyldecane

Isomers Compounds that have the same chemical formula, but different shapes

Types of Isomers Structural or skeletal Geometric or cis/trans Functional Positional Optical

Structural Isomers When there are differences in the carbon chains

Structural Isomers C-C-C-C-C C C-C-C-CC-C-C CC

Structural Isomers C-C-C-C-C C C-C-C-CC-C-C CC

Structural Isomers Pentane methyldimethyl butanepropane

Draw & name all the possible structural isomers for C 7 H 16

Organic HW: Draw & name all the possible structural isomers for C 6 H 14

Drill: Name: C-C-C C C-C-C-C-C-C-C C C-C

C-C-C C C-C-C-C-C-C-C C C-C

3,5-diethyl-3,5- dimethyloctane

Test _____day

Drill: Name & describe 5 organic prefixes & 4 organic suffixes

Test on Alkanes tomorrow

Review

Identify Organic terms Organic prefixes Organic suffixes

Name: H 3 C-CH-CH 2 -C-CH 2 -CH 3 CH 3 -CH 2 CH 3 CH 3 -CH 2

H 3 C-CH-CH 2 -C-CH 2 -CH 3 CH 3 -CH 2 CH 3 CH 3 -CH 2

3-ethyl-3,5-dimethylheptane H 3 C-CH-CH 2 -C-CH 2 -CH 3 CH 3 -CH 2 CH 3 CH 3 -CH 2

Name: C-C-C-C-C-C-C-C-C C-C C C CC

C-C-C-C-C-C-C-C-C C-C C C CC

C-C-C-C-C-C-C-C-C C-C C C CC 6,7-diethyl-3,4,7-trimethyldecane

Name:

5-ethyl-2,4,6,7- tetramethylnonane

Name:

5-butyl-2,3,7,8-tetramethyl-6-propyldecane

Draw the complete structure of: 3-ethyl-2-methylpentane

Draw the condensed structure of: 3-ethyl-2,4,5-trimethylhexane

Draw a skeletal structure of: hexamethylpentane

Draw a stick structure of: 5-butyl-3-ethyl-2,4,6,8- tetramethyl-4-propyl decane

Draw & Name isomers of: C 8 H 18

Draw an optical isomer of: C-C-C-C-C-C-C C C C