Chair Conformations

[woox]

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Few Questions:

For chair conformations do we always place the Halide (ex Cl, Br, I) or the carbon group (CH3, ethyl etc..) at the equatorial position?

If we have both a carbon group and halide, does the carbon group take priority at the equatorial position?

And last,

When converting from chair > to boat > chair, do all the equatorial/axial attached stuff swap places?

 

[rockclock]

Few Questions:

For chair conformations do we always place the Halide (ex Cl, Br, I) or the carbon group (CH3, ethyl etc..) at the equatorial position?

If we have both a carbon group and halide, does the carbon group take priority at the equatorial position?

And last,

When converting from chair > to boat > chair, do all the equatorial/axial attached stuff swap places?

Yes, that's the most stable conformation.

Yes, the alkyl group is bigger than the halide.

Yes, a chair-flip switches everything that was equatorial to axial and vice versa.

 

[woox]

If you have a -CH3 group and a -Cl group do they both go @ equitorial position or does CH3 go to the equitoral and -Cl go to axial?

Example: 1-chloro-4-methylcyclohexane

 

[rockclock]

If you have a -CH3 group and a -Cl group do they both go @ equitorial position or does CH3 go to the equitoral and -Cl go to axial?

Example: 1-chloro-4-methylcyclohexane

are you told whether it is cis or trans?

for your example:

the most stable would be both equitorial, but that's only available in the trans isomer.

in the cis isomer, one substituent is going to be axial and the other is going to have to be equitorial...most stable is methyl (larger group) equitorial and chloride (smaller group) axial.

 

[rockclock]

by the way, you have to work out whether both equitorial is going to be an option on a case by case basis...it's not a hard-and-fast rule about cis/trans...it varies for 1,2; 1,3; and 1,4.

these have substituents either both axial or both equitorial:
trans 1,2
cis 1,3
trans 1,4

these always have one substituent axial and the other equitorial:
cis 1,2
trans 1,3
cis 1,4