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SUBSTITUE ORTHO [2 records]

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Record 1 2007-07-18

English

Subject field(s)
  • Chemical Elements and Compounds
CONT

Using n.m.r. methods developed in earlier papers, the conformations of two series, one doubly ortho-substituted and one triply ortho-substituted, of six identically substituted bridged diphenyls were compared. The ethers, sulfides, and methanes have been shown to adopt the same conformation in which the di-ortho-substituted ring is perpendicular to the central bridge plane while the other ring lies in that plane and an ortho hydrogen takes up the "inside" or "proximal" position.

OBS

ortho-: Must be italicized.

Key term(s)
  • ortho substituted

French

Domaine(s)
  • Éléments et composés chimiques
CONT

En utilisant les méthodes r.m.n. décrites dans les articles précédents on a comparé les conformations de deux séries de six diphényles pontés portant des substituants identiques, l'une doublement substituée en ortho, l'autre triplement substituée en ortho. On a montré que les éthers, les sulfures et les méthanes adoptent une même conformation où le cycle di-ortho substitué est perpendiculaire au plan du pont central, plan qui contient l'autre cycle, un hydrogène ortho occupant la position «intérieure» ou «la plus rapprochée».

OBS

ortho- : Doit s'écrire en italique.

Spanish

Save record 1

Record 2 1999-12-07

English

Subject field(s)
  • Pollution (General)
OBS

Pollution.

French

Domaine(s)
  • Pollution (Généralités)
OBS

Pollution.

Spanish

Save record 2

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