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Decomposition of the rigid polycyclic beta,gamma-unsaturated diazomethyl ketones (1a) and (1b) and (2a) and (2b) promoted by ‘activated CuO’, Cu(acac)2, Cu(OTf)2, or Ni(acac)2 in the presence of methanol are shown to give mainly the corresponding rearranged gamma,delta-unsaturated angularly substituted esters (3a) and (3b) and (8a) and (8b) together with the alpha-methoxy ketones (4a) and (4b) and (9a) and (9b).While photo-Wolff rearrangement of the diazo ketones leads to the corresponding homologous esters (5a) and (5b) and (10a) and (10b) the silver benzoate-triethylamine induced reaction gives the rearranged esters in addition to the homologous esters.
Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.Reference of 13395-16-9, you can also check out more blogs aboutReference of 13395-16-9
Reference：
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”