antarafacialadj.

Brit.

/ˌantərəˈfeɪʃl/, U.S.

/ˌæntərəˈfeɪʃ(ə)l/

Origin: A borrowing from Sanskrit, combined with an English element. Etymons: Sanskrit antara , facial adj.

Etymology: < Sanskrit antara different, other (see other adj.) + facial adj. Compare suprafacial adj.

Chemistry.

Of a pericyclic reaction: involving the formation or breaking of bonds on opposite faces of the transition state. Contrasted with suprafacial adj. 2.

ΚΠ

1965 R. B. Woodward & R. Hoffmann in Jrnl. Amer. Chem. Soc. 87 2512/1 In the..antarafacial process, the migrating atom is passed from the top face of one carbon terminus to the bottom of the other, through a transition state characterized by a twofold axis of symmetry.

1974 G. B. Gill & M. R. Willis Pericyclic Reactions iii. 69 There are but four important stereochemical consequences for all two-component cyclo-addition reactions, and these depend upon whether the new σ-bonds are made on the same face of each reacting molecule (suprafacial), or on opposite faces (antarafacial).

2007 Proc. National Acad. Sci. U.S.A. 104 13319/2 There is an antarafacial relation between initial hydrogen abstraction and subsequent oxygen insertion.

This entry has been updated (OED Third Edition, March 2016; most recently modified version published online December 2021).

单词	antarafacial
释义	antarafacialadj. Brit. /ˌantərəˈfeɪʃl/, U.S. /ˌæntərəˈfeɪʃ(ə)l/ Origin: A borrowing from Sanskrit, combined with an English element. Etymons: Sanskrit antara , facial adj. Etymology: < Sanskrit antara different, other (see other adj.) + facial adj. Compare suprafacial adj. Chemistry. Of a pericyclic reaction: involving the formation or breaking of bonds on opposite faces of the transition state. Contrasted with suprafacial adj. 2. ΚΠ 1965 R. B. Woodward & R. Hoffmann in Jrnl. Amer. Chem. Soc. 87 2512/1 In the..antarafacial process, the migrating atom is passed from the top face of one carbon terminus to the bottom of the other, through a transition state characterized by a twofold axis of symmetry. 1974 G. B. Gill & M. R. Willis Pericyclic Reactions iii. 69 There are but four important stereochemical consequences for all two-component cyclo-addition reactions, and these depend upon whether the new σ-bonds are made on the same face of each reacting molecule (suprafacial), or on opposite faces (antarafacial). 2007 Proc. National Acad. Sci. U.S.A. 104 13319/2 There is an antarafacial relation between initial hydrogen abstraction and subsequent oxygen insertion. This entry has been updated (OED Third Edition, March 2016; most recently modified version published online December 2021). < adj.1965
随便看	obviscate obvolate obvolation obvolute obvolution obvolutions obvolutive obvolve obvolved nonconsensual nonconsensually nonconsent nonconsenter nonconsentient nonconsenting nonconsequence nonconservation nonconservations nonconservative nonconservatives nonconsideration nonconsociety nonconsonantal nonconstitutional nonconstructive