Introduction.- Crystalline State Reaction and Reaction Cavity -- Racemizations of Alkyl Groups in Cobaloxime Complex -- Characteristic Processes of Various Racemizations -- Photoisomerization of Alkyl Groups in Cobaloxime Complexes -- Control of Reactivity -- Metastable or Unstable Intermediates in Reversible Processes -- Metastable or Unstable Intermediates in Reversible Processes -- Conclusion.