Nalli's Stuff - Interactive Models and Animations for Chemistry 447

The models and animations will not work in Internet Explorer due to MicroSoft's failure to support the MDL Chime plug-in. In order to view them you will need to install an old version of Netscape and then install the MDL Chime Plug-In. Detailed instructions are here.

Here is a page that shows the molecular orbitals (from ab initio calculation) for ethylene.

1,1,1-propellane - Note the inverted tetrahedra.

dodecahedrane - Is it really the most stable C₂₀H₂₀ isomer? Extra credit - come up with another likely contender and use molecular mechanics to check the relative stabilitites.

adamantane - Definitely the most stable C₁₀H₁₆ isomer.

4-e conrotatory ring opening/closure - This animation shows the conrotatory mode of ring opening of cyclobutene to butadiene, a symmetry allowed (and geometrically feasible, especially for ring opening) process.

1s,7a sigmatropic shift - This animation shows the antarafacial 1,6 shift of a hydrogen atom in heptatriene, a symmetry allowed (and geometrically feasible) process.

3s,3s sigmatropic shift - This animation shows the degenerate 3s,3s shift of a C-C bond in 1,5-hexadiene, a symmetry allowed (and geometrically feasible) process. (Cope rearrangement.)

Bullvalene - This animation shows some of the multiple degenerate Cope rearrangements that this compound undergoes. One consequence is that all of the protons are magnetically equivalent (one peak in ¹H NMR).