Jmol animations

Conformations of 2-Bromobutane which lead to two geometric isomers of butene

Play the animation. Zoom in and take a closer look


Manipulate the model to explore the arrangements of the protons and the bromine. Are they antiperiplanar as required for E2?

Play the animation to rotate the central C-C bond. Using the frame next button, manipulate the model to see the two Antiperiplanar possibilities. Can you arrange the model to mimic the Newman projections?

Note the spatial relationship of the two methyl groups leading to Z- and E-butene.

Examine the animated energy plot to determine the relative energies of the antiperiplanar conformations required for E2 elimination.

Load these animations which show the reaction of 2-chlorobutane giving E- and Z-butene.