sentence: Light can also cause the double bonds to form a ring.
sentences_after: After the electron is promoted to the higher orbital, orbital symmetry allows the reaction to proceed in a suprafacial-suprafacial manner. An example is the DeMayo reaction. Another example is shown below, the photochemical dimerization of cinnamic acid.
concept_name: light
headings: Cycloaddition Reaction mechanism
categories: Chemical reactions