Question

are special type of cycloadditions
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Answer 1

Answer:

Cycloaddition is a pericyclic chemical reaction in which two or more independent π systems combine with a cyclic movement of electrons, resulting in the formation of a ring with net reduction in the bond multiplicity.

Answer 2

• A cycloaddition is a chemical reaction, in which "two or more unsaturated molecules combine with the formation of a cyclic adduct in which there is a net reduction of the bond multiplicity." The resulting reaction is a cyclization reaction. Many but not all cycloadditions are concerted and thus pericyclic.