Naming drawing exercises
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Naming/ Drawing Exercises. 2,2,6,7-tetramethylnonane. 1. 2. 3…. Careful with the parent chain!!! Don’t be fooled by the seeming 1-tert-butyl group LOL. 3-ethyl-4-isopropyl-2,5-dimethylheptane. 7. 3. 2. 1.

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Naming/ Drawing Exercises

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Naming drawing exercises

Naming/ Drawing Exercises


2 2 6 7 tetramethylnonane

2,2,6,7-tetramethylnonane

1

2

3…

Careful with the parent chain!!! Don’t be fooled by the seeming 1-tert-butyl group LOL.


3 ethyl 4 isopropyl 2 5 dimethylheptane

3-ethyl-4-isopropyl-2,5-dimethylheptane

7

3

2

1

The trick here is to remember WE PREFER HAVING MORE BRANCHING when we find 2 or more possible parent chains.


3 3 6 triethyl 6 methyloctane

3,3,6-triethyl-6-methyloctane

2

1

3

Since we can’t reduce numbering either way (3,3,6,6) WE NOW CHOOSE NUMBERING WITH ALPHABETICAL PRIORITY… smaller numbers for ‘e’ in ethyl than ‘m’ for methyl.


1 1 2 triethyl 2 methylcyclopentane

1,1,2-triethyl-2-methylcyclopentane

Since we can’t reduce numbering either way (1,2 or 2,1) WE NOW CHOOSE NUMBERING WITH ALPHABETICAL PRIORITY… smaller numbers for ‘e’ in ethyl than ‘m’ for methyl.


1 ethyl 1 2 4 trimethyl 4 propan 2 yl cyclohexane or 1 ethyl 4 isopropyl 1 2 4 trimethylcyclohexane

1-ethyl-1,2,4-trimethyl-4-(propan-2-yl)cyclohexane or 1-ethyl-4-isopropyl-1,2,4-trimethylcyclohexane


Most stable form

Most stable form?

H


Most stable form1

Most stable form?

ETHYL Too bulky for axial!

H

ISOPROPYL also too bulky


More stable

More Stable?

H

After a RING FLIP, the bulkier groups are now along the EQUATORIAL POSITION, with less steric strain, because the bulky groups are all pointing out of the ring, and not “blocking” other groups/ having repulsions with other electron clouds.


Naming drawing exercises

The same or different?

H

H


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