Question

Question 1: Make models of cyclobutane and cyclohexane and then carefully draw these models

a) Does anything become apparent to you when you are making one model compared to the other?

b) Describe the shapes of these molecules and indicate what types of strain might be present in each.

c) Are either of your models "flat" like a hexagon or a square?

Question 2: Make a model of cyclopentane.

a) Is your model flat like a pentagon?

b) Why or why not?

Question 3: Make 2 models of the most stable conformations of cyclohexane and carefully draw each of them.

a) Are all the hydrogens in these models the same?

b) Highlight any that are different and any that are the same.

Question 4: Practice converting one chair to another and draw the different stages involved.

a) Write down your observations.

b) Draw 3 intermediate structures involved in the interconversion from one conformer to the other.

c) Explain why a "concerted" process would be unlikely in this conversion.

d) What would be the conformational shape of the intermediate involved in such a concerted process?

Answer 1

Aaswery H yelobutane H H 2 Gycloheane H and flatness dler neaSes As the ing stauetone becomes mOne stable Size Inc neases b) cobutane has Canbone atomg and in another plane tonls ane just behind cach othen And bond ang le obne in one p less than bdag ne As a nesult there is angle shnain An bonl oppositin strain flerible StouchsIG bith 3 amo TIe Cyclo hevane has phne andd in arether. Bond bon atoms in one slightly greten than b less othen bond Thwe is voy darae chirh is behird any ic lao angle No bon

bond opposition shvain And some amount no angle shoain c) None othe meakis is flat