sentence: Chemists disagree whether some reactions are pericyclic reactions.
sentences_before: Many pericyclic reactions have similar stepwise radical processes connected with them.
sentences_after: Many pericyclic reactions have similar reactions that are metal-catalyzed. But these metal-catalyzed reactions are also not really pericyclic. The metal catalysts stabilize the reaction intermediates. So the reaction is not concerted, but rather metal-stabilized.
concept_name: chemist
headings: Pericyclic reaction
categories: Pericyclic reactions Rearrangement reactions