Conformational Analysis of Substituted Cyclohexanes (Contd.) -1

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[@rohanmoktan4923]

Thankyou sir! This is the best lecture series on stereochemistry that I have ever encountered in my life.

[@snehadasgupta338]

Sir u explained it really well🙏

[@arkojrdutta2260]

Thankyou

[@raghavkishore477]

Sir what do you mean by alpha , beta methyl

[@subhajitmondal7823]

Excellent

[@tomshouse2189]

Sir you are too good

[@arindamsarma3484]

Sir why in 1,2 dimethyl cyclohexane energy calculation, only gauche butane interaction is considered not 1,3diaxial interaction?

[@abhijitbhattacharjee7138]

there will be equal amount of 1,3 diaxial interaction

[@arindamsarma3484]

But during calculation of absolute energy, 1,3 diaxial interaction should be included.

[@abhijitbhattacharjee7138]

@@arindamsarma3484 you can ofcourse include that...but in the cis form both form will have equal 1,3 diaxial interaction which will kinda cancel each other's effect...i hope you are getting my point...during calculation of absolute energy 1,3 diaxial interaction will be considered..

[@amitbasak4819]

One thing needs to be clear and that is gauche butane interaction do include the 1,3-CH3-H diaxial interaction That is why the gauche butane CH3-H diaxial interaction has the same value as one gauche butane interaction.

[@abhijitbhattacharjee7138]

@@amitbasak4819 okay Sir! thank you

[@rishikeshsharma4148]

Sir but 1,3 dimethyl is achiral compound?

[@amitbasak4819]

Cis-1,3 dimethyl cyclohexane is achiral because of presence of sigma plane . Trans 1,3-dimethyl cyclohexane is chiral because it is dissymmetric and flipping produces the same conformer that you have started. This is unlike cis-1,2 dimethyl cyclohexane where flipping produces the non superimposable mirror image and hence it exists as a non-resolvable dl-pair.

[@rishikeshsharma4148]

@@amitbasak4819 thanks sir😊 i got it