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Cyclo Addition Reactions and Orbital symmetry Considerations A [2+2] system


Ms. Manasa

two ethene molecules add on giving cyclobutane
The Theory
symmetry in 4n rxn
The MO diagram of the interacting orbitals and their symmetry properties

Now let us consider the interacting orbitals of the product that is, cyclobutane. Two sigma bonds are involved hence there are four interacting orbitals shown below along with their symmetry properties as discussed earlier.

Now we construct a correlation diagram using the symmetry elements of the orbitals of the reactant on one side and the product on the other.
Next Page A [ 4+ 2 ] reaction
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