In the second example, we demonstrate how the topological features of an energy landscape manifest themselves as a chemical system is modified. We specifically consider the chain growth polymerization of polypropylene. As shown in Figure , a single unit of polypropylene is added to a trimer to form a tetramer. The monomer unit of polypropylene has no dihedral angles; during chain growth bond formation, the degree of the two bond forming C-atoms (highlighted in the black dashed box) are altered which introduces two new dihedral angles to the conformational PEL. In