I understand that #1 isthe most stable conformation because the largest substitu

Question

I understand that #1 isthe most stable conformation because the largest substituent-t-Butyl is in the equatorial position. Also, I see that #2 is alsoa chair conformation, however less stable because of axial positionof t-Butyl group.
#3 is a boat conformation.

I wonder how #4 and #6 aredrawn. It seems that positions of carbon 1 and 4 are changed. Thesemust be twisted boat conformations but I have no clue how ourprofessor drew them. Also I can`t understand how he drew #5. Itlooks like boat conformation, but how he managed to get both groupsfacing away from each other.

I would appreciate ifsomeone can help me to figure out how to draw twisted boat and boatconformations. Thank you in advance!

Explanation / Answer

In #3, they're both "up". In #4, down. The same istrue for 4 and 6. It doesn't matter which carbon you drawthem on, as long as there are the right number of carbons inbetween, and so long as they stay cis, you can draw it in any way. It's all still the same molecule.

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