Another reaction of this type has its stereochemistry determined by the degree of intersystem crossing; that reaction is named for Norrish.
Reactions of this type are responsible for rearrangements of the Mariano compound and the Pratt diene. The decolorization of santonin is an early example of this type of reaction. A reaction of this type that synthesizes oxetane is the Paterno-Buchi reaction. Another reaction of this type has its stereochemistry determined by the degree of intersystem crossing; that reaction is named for Norrish. Electrocyclic reactions of this type on molecules with an even number of conjugated pi bonds are disrotatory and on those with an odd number of conjugated pi bonds are conrotatory according to the Woodward-Hoffmann rules, which contrast this type of control with (*) thermal control. Other reactions of this type include the dimerization of ethylene, the closure of 1,3-butadiene to cyclobutadiene, and the formation of halogen radicals from CFCs in the atmosphere. For 10 points, name this type of reaction in which activation energy is provided by photons.
Reactions of this type are responsible for rearrangements of the Mariano compound and the Pratt diene.
photochemical reactions [accept light-catalyzed reactions, photon-catalyzed reactions before mention, anything with the prefix “photo” in it, etc]