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In general, lower temperatures favor the formation of the end adduct due to the Le Chatelier's principle. This principle states that if a change of condition is applied to a system in equilibrium, the system will shift in a direction that relieves the stress. In the case of adduct formation, the reaction is often exothermic, meaning it releases heat. Lowering the temperature adds stress to the system, and to relieve this stress, the equilibrium will shift towards the side that produces heat, which is the end adduct formation.