TERMIUM Plus®
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ANTARAFACIAL [2 records]
Record 1 - internal organization data 2011-07-25
Record 1, English
Record 1, Subject field(s)
- Chemistry
Record 1, Main entry term, English
- conrotary
1, record 1, English, conrotary
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- antarafacial 2, record 1, English, antarafacial
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
In stereochemistry, a process is termed conrotatory (or antarafacial) if the interacting termini of the conjugated system both rotate in the same sense ... 3, record 1, English, - conrotary
Record 1, French
Record 1, Domaine(s)
- Chimie
Record 1, Main entry term, French
- conrotatoire
1, record 1, French, conrotatoire
correct
Record 1, Abbreviations, French
Record 1, Synonyms, French
- antarafacial 2, record 1, French, antarafacial
correct
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
Se dit de mouvements dans le même sens de rotation de liaison autour d'autres liaisons que l'on doit effectuer pour ouvrir ou fermer un cercle. 3, record 1, French, - conrotatoire
Record number: 1, Textual support number: 1 OBS
Caractérise le processus de fermeture des chaînes antisymétriques par recouvrement des orbitales de même signe. 4, record 1, French, - conrotatoire
Record number: 1, Textual support number: 1 CONT
[En stéréochimie], un processus est dit conrotatoire (ou antarafacial) lorsque la formation de la liaison implique de la part des deux extrémités du système conjugué une rotation dans le même sens [...]. 5, record 1, French, - conrotatoire
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 1996-10-11
Record 2, English
Record 2, Subject field(s)
- Chemistry
Record 2, Main entry term, English
- antarafacial
1, record 2, English, antarafacial
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record number: 2, Textual support number: 1 CONT
When a part of a molecule ("molecular fragment") undergoes two changes in bonding (bond-making or bond-breaking), either to a common centre or to two separate centres, external to itself, these bonding changes may be related in one of two spatially distinct ways. These are designated as "antarafacial" if opposite faces of the molecular fragment are involved, and "suprafacial" if both changes occur at the same face .... The terms antarafacial and suprafacial are, however, also employed in cases in which the essential part of the molecular fragment undergoing changes in bonding comprises two atoms linked only by a [sigma]-bond. In these cases it is convenient to refer to the phases of the local [sigma]-bonding orbital: occurrence of the two bonding changes at sites of like orbital phase is regarded as suprafacial, whereas that at two sites of opposite phase is antarafacial. 1, record 2, English, - antarafacial
Record 2, French
Record 2, Domaine(s)
- Chimie
Record 2, Main entry term, French
- antarafacial
1, record 2, French, antarafacial
correct
Record 2, Abbreviations, French
Record 2, Synonyms, French
Record 2, Textual support, French
Record number: 2, Textual support number: 1 CONT
Lorsqu'un «fragment moléculaire» (partie d'une molécule) subit deux changements dans sa façon de se lier (cette expression comprend la disparition d'une liaison ou la formation d'une liaison là où il n'en existait pas) avec un ou deux centres externes à ce fragment, ces changements de liaison peuvent être corrélés selon deux modes géométriquement distincts. Si ces changements se produisent sur des faces opposées du fragment moléculaire, on les désigne par le terme «antarafacial» et par «suprafacial» s'ils se produisent sur une même face. [...] les termes antarafacial et suprafacial sont aussi utilisés lorsque les changements de liaison concernent un fragment moléculaire comprenant deux atomes liés seulement par une liaison -[sigma]. Il est alors commode de faire référence aux phases de l'orbitale liante de symétrie locales. Ainsi, lorsque les deux changements mettent en jeu des sites orbitalaires de même signe de fonction d'onde, on utilise le qualificatif de suprafacial tandis que, dans le cas contraire, le terme antarafacial est employé. [...] 1, record 2, French, - antarafacial
Record number: 2, Textual support number: 1 OBS
À cause de contraintes informatiques, il est impossible de reproduire les lettres grecques. 2, record 2, French, - antarafacial
Record 2, Spanish
Record 2, Textual support, Spanish
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