pericyclicadj.

Brit.

/ˌpɛrɪˈsʌɪklɪk/, U.S.

/ˌpɛrəˈsɪklɪk/,

/ˌpɛrəˈsaɪklɪk/

Origin: Formed within English, by derivation. Etymons: peri- prefix, cyclic adj.

Etymology: < peri- prefix + cyclic adj. (see quot. 1969).

Chemistry.

Of a reaction: involving 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. Cf. Woodward–Hoffmann n.

ΘΚΠ

the world > matter > chemistry > organic chemistry > chemical processes or reactions > [adjective] > miscellaneous other

Kolbe1885

pericyclic1969

1969 R. B. Woodward & R. Hoffmann in Angewandte Chemie (Internat. ed.) 8 848/1 We have laid the basis for a general consideration of all pericyclic reactions—that is, reactions in which all first-order changes in bonding relationships take place in concert on a closed curve.

1974 G. B. Gill & M. R. Willis Pericyclic Reactions iv. 99 The basic tenet of the Woodward–Hoffmann theory is that orbital symmetry is conserved in concerted pericyclic reactions.

1998 Chem. in Brit. Sept. 28/2 The potential energy surface of a sequence of pericyclic reactions starting from compounds.

This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	pericyclic
释义	pericyclicadj. Brit. /ˌpɛrɪˈsʌɪklɪk/, U.S. /ˌpɛrəˈsɪklɪk/, /ˌpɛrəˈsaɪklɪk/ Origin: Formed within English, by derivation. Etymons: peri- prefix, cyclic adj. Etymology: < peri- prefix + cyclic adj. (see quot. 1969). Chemistry. Of a reaction: involving 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. Cf. Woodward–Hoffmann n. ΘΚΠ the world > matter > chemistry > organic chemistry > chemical processes or reactions > [adjective] > miscellaneous other Kolbe1885 pericyclic1969 1969 R. B. Woodward & R. Hoffmann in Angewandte Chemie (Internat. ed.) 8 848/1 We have laid the basis for a general consideration of all pericyclic reactions—that is, reactions in which all first-order changes in bonding relationships take place in concert on a closed curve. 1974 G. B. Gill & M. R. Willis Pericyclic Reactions iv. 99 The basic tenet of the Woodward–Hoffmann theory is that orbital symmetry is conserved in concerted pericyclic reactions. 1998 Chem. in Brit. Sept. 28/2 The potential energy surface of a sequence of pericyclic reactions starting from compounds. This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022). < adj.1969
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