Chairs

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created 1 year ago by abmusser
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updated 1 year ago by abmusser
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1
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What is this?

A cyclohexane chair

2
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In a chair, each carbon has and __________ Hydrogen & an __________ Hydrogen

Equatorial

Axial

3
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1. Which Hydrogens are equatorial?

2. Which Hydrogens are axial?

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1. The ones with circles around them

2. The ones with squares around them

4

If the bend of the carbon is up then the axial Hydrogen is __________ and the equatorial Hydrogen is __________.

If the bend of the carbon is up then the axial Hydrogen is up and the equatorial Hydrogen is down.

5

Rules for doing a chair flip:

1. On each carbon, anything that started as axial down becomes __________ __________.

2. On each carbon, anything that started as axial up becomes __________ __________.

3. On each carbon, anything that started as equatorial up becomes __________ __________.

4. On each carbon, anything that started as equatorial down becomes __________ __________.

1. On each carbon, anything that started as axial down becomes equatorial down.

2. On each carbon, anything that started as axial up becomes equatorial up.

3. On each carbon, anything that started as equatorial up becomes axial up.

4. On each carbon, anything that started as equatorial down becomes axial down.

6
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Draw the chair flip

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7
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Draw the chair flip

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8

What makes a chair less stable?

1,3 diaxial interactions

9

You can tell a chair has 1,3 diaxial interactions when the methyl group is in the __________ position.

Axial

10

When talking about chairs:

Wedges =

Dashes =

Wedges = Substituent is up

Dashes = Substituent is down

11
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Draw the chair of this molecule

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12
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Draw the chair flip of this

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13
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Which one is more stable?

The one to the left or the one to the right?

The one to the right because the C4H9 is in the equatorial position.

14
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Draw the chair for this

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15
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Draw the chair flip

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16
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Which is more stable?

the one to the left or the one to the right?

The one to the right because its methyl groups are both equatorial.

17
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Draw the chair of this molecule

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18
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Draw the chair flip of this

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19
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Label each chair as cis, trans, or neither.

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A - cis

B - trans

C - neither