1Chemistry Relating to or denoting a reaction that involves a concerted rearrangement of bonding in which all the bonds broken or formed in the reaction lie on a closed ring, whether or not a cyclic molecule is involved.
〔化〕周环反应的
Example sentencesExamples
In pericyclic reactions, bonds are made or broken in a concerted cyclic transition state.
But, because the mechanism for the reaction is pericyclic, there is retention of geometry such that quite specific products can be generated.
Chemists everywhere are now familiar with the Woodward-Hoffmann rules for pericyclic reactions, which tied a whole list of cyclizations and rearrangements into a coherent bundle.
2Botany Relating to a pericycle.
〔植〕中柱鞘的
Example sentencesExamples
Azima tetracantha bark is distinctive in having bundle cap (‘pericyclic’) fibers and sclereid nests in phloem rays.