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DISROTATORY [1 record]
Record 1 - internal organization data 2011-02-11
Record 1, English
Record 1, Subject field(s)
- Chemistry
Record 1, Main entry term, English
- disrotatory
1, record 1, English, disrotatory
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- suprafacial 2, record 1, English, suprafacial
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 OBS
[An electrocyclic reaction corresponds to] a molecular rearrangement that involves the formation of a [sigma]-bond between the termini of a fully conjugated linear [pi]-electron system (or a linear fragment of a [pi]-electron system) and a decrease by one in the number of [pi]-bonds, or the reverse of that process. The stereochemistry of such a process is termed ... disrotatory (or suprafacial) if one terminus rotates in a clockwise and one in the counter-clockwise sense ... 2, record 1, English, - disrotatory
Record number: 1, Textual support number: 2 OBS
The words "sigma" and "pi" must be replaced by the corresponding Greek letters. 3, record 1, English, - disrotatory
Record 1, French
Record 1, Domaine(s)
- Chimie
Record 1, Main entry term, French
- disrotatoire
1, record 1, French, disrotatoire
correct, adjective
Record 1, Abbreviations, French
Record 1, Synonyms, French
- suprafaciale 2, record 1, French, suprafaciale
correct
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
Se dit de mouvements en sens contraires de rotation de liaison autour d'autres liaisons que l'on doit effectuer pour ouvrir ou fermer un cycle. 2, record 1, French, - disrotatoire
Record number: 1, Textual support number: 1 OBS
[Par réaction électrocyclique, l'on entend le] réarrangement moléculaire qui comporte la formation d'une liaison-[sigma] entre les extrémités d'un système linéaire et totalement conjugué d'électrons-[pi] (ou d'un fragment linéaire d'un système-[pi] ainsi qu'une diminution d'une unité du nombre de liaisons-[pi]. L'expression désigne aussi le processus inverse. La stéréochimie d'un tel processus est dite [...] disrotatoire (ou suprafaciale) lorsque la rotation d'une des extrémités se fait dans un sens et celle de l'autre dans le sens contraire [...] 3, record 1, French, - disrotatoire
Record number: 1, Textual support number: 2 OBS
Les mots «sigma» et «pi» doivet être remplacés par les lettres grecques correspondantes. 4, record 1, French, - disrotatoire
Record 1, Spanish
Record 1, Textual support, Spanish
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