Word Count : 242

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1,3-Dipolar cycloaddition is a reaction in which a 1,3-dipole reacts with a dipolarophile, such as an alkene or alkyne, to form a five-membered heterocyclic ring. In the context of pyrazole synthesis, the 1,3-dipole is commonly a diazo compound or nitrile imine, which contains a resonance-stabilized structure with a _________ ________ _____ __________ _______.
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