单词	pericyclic
释义	pericyclic /ˌpɛrɪˈsʌɪklɪk / /ˌpɛrɪˈsɪklɪk/ adjective 1 Chemistry 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.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. 2 Botany Relating to a pericycle.Azima tetracantha bark is distinctive in having bundle cap (‘pericyclic’) fibers and sclereid nests in phloem rays.
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