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HETEROCUMULENES [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2002-01-15

English

Subject field(s)
  • Chemistry
  • Chemical Elements and Compounds
CONT

dienes: Compounds that contain two fixed double bonds (usually assumed to be between carbon atoms). ... Dienes in which one or more of the unsaturated carbon atoms is replaced by a heteroatom may be called heterodienes.

OBS

For example H2=CH-N=CH2; this term is rarely used. Heteroalkenes(q. v.) and heterocumulenes(q. v.) are better terms.

French

Domaine(s)
  • Chimie
  • Éléments et composés chimiques
CONT

diène : Composé qui comporte deux doubles liaisons fixes (en général, elles sont situées entre des atomes de carbone). [...] Les diènes dans lesquels un (ou plusieurs) atomes de carbone insaturé(s) est (sont) remplacé(s) par un hétéroatome sont nommés hétérodiènes.

OBS

Par exemple H2=CH-N=CH2; terme rarement utilisé. Les termes hétéroalcènes et hétérocumulènes (voir aussi ces fiches) sont meilleurs.

Spanish

Save record 1

Record 2 2002-01-15

English

Subject field(s)
  • Chemical Elements and Compounds
DEF

heterocumulenes : Cumulenes in which one or more carbon atoms of the cumulative bond system have been replaced by heteroatoms.

OBS

[For example:] O=C=C=C=O, but not CH2=C=O, ketene, nor O=C=O, carbon dioxide, which are heteroallenes.

OBS

heterocumulene : term often used in the plural("heterocumulenes").

Key term(s)
  • heterocumulenes

French

Domaine(s)
  • Éléments et composés chimiques
DEF

Cumulène dans lequel un (ou plusieurs) atome(s) de carbone du système de liaisons cumulées a (ont) été remplacé(s) par un (ou des) hétéroatome(s).

OBS

Par exemple : O=C=C=C=O, mais pas CH2=C=O, dioxyde de carbone, qui sont des hétéroallènes.

OBS

hétérocumulène : terme souvent utilisé au pluriel («hétérocumulènes»).

Key term(s)
  • hétérocumulènes

Spanish

Save record 2

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