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==Modelling Using Molecular Mechanics==

===The Hydrogenation of Cyclopentadiene Dimer===

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Dimerisation of cyclopentadiene proceeds via a Diels-Alder reaction to produce specifically the endo dimer '''2''' rather than the exo dimer ''''1'''. 

Depending upon the orientations in which the dienophile approaches the diene, two stereoisomers can be formed;

By optimising the geometries of