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Transcript of parallel bonds
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parallel bondsparallel bondsparallel bonds
Drawing Cyclohexane
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equatorial bonds
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axial bonds
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equatorial bonds axial bonds
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1 2 3
4
5
6
Start anywhere and number consecutive carbons.
Numbering Cyclohexane
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tetrahedral carbon
1
Tetrahedral Carbons in Cyclohexane
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tetrahedral carbon
2
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tetrahedral carbon
3
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tetrahedral carbon
4
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tetrahedral carbon
5
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tetrahedral carbon
6
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1 2 3
4
5
6
6 axial bonds (green) (3 straight up; 3 straight down)
6 equatorial bonds (blue) (3 slightly up; 3 slightly down)
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12
Disubstituted Isomers of Cyclohexane
and . . .
two equatorial substituents (purple)name of cpd: trans-1,2-di . . . cyclohexane
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two axial substituents (purple)name of cpd: trans-1,2-di . . . cyclohexane
1
2
are conformational isomers of one another.
Also, . . .
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1 3
and . . .
two equatorial substituents on carbons 1 & 3 name of cpd: cis-1,3-di . . . cyclohexane
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1
3
two axial substituents on carbons 1 & 3 name of cpd: cis-1,3-di . . . cyclohexane)
are conformational isomers of one another.
Furthermore, . . .
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1
4
two equatorial substituents on carbons 1 & 4 name of cpd: trans-1,4-di . . . cyclohexane)
and . . .
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1
4
two axial substituents on carbons 1 & 4name of cpd: trans-1,4-di . . . cyclohexane
are conformational isomers of one another.
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flip this C above the plane
flip the other C below the plane
hold red bonds in a plane
the other chair conformation
you get
Chair Conformations of Cyclohexane
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number carbons in thisconformation
12
3
45
6
number the same carbons in this conformation 1
23 4
56
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12
3
45
6
1
23 4
56given the plane
formed by carbons2, 3, 5, and 6
C1 is below the planeand ...
C4 is above the plane,while...
C1 is above the plane and...
C4 is below the plane.
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21 3
456
2
61
4
5
3equatorial bondshere become ...
axial bonds here, and...equatorial bonds here.
axial bondshere become ...
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1 2 3
4
5
6
Equatorial bonds alternate being above and below the axial bonds on a given carbon atom
above
above
below
below
below
above
and . . .
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1 2 3
4
5
6
axial bonds alternate being above and below the equatorial bonds on a given carbon atom.
above
below
belowbelow
above
above
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The End
And what a nifty cool story it was . . .