Abstract
Recently many solid-state reactions were found to proceed with retention of the crystalline lattice. These reactions are called as crystalline-state reaction, in which the structural changes can be observed by X-ray crystal structure analysis. The racemization of the chiral alkyl groups and the β-α isomeriztion of the alkyl groups on exposure to visible light have been extensively studied. The analyses of the intermediate structures and the application of the reaction cavity for the reactive groups made clear the reaction mechanism not only qualitatively but also quantitatively.