OC - Theorie at Universität Wien

Flashcards and summaries for OC - Theorie at the Universität Wien

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Synperiplanare Konformation (Newman-Projektion)

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Antiperiplanare Konformation(Newman Projektion)

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Newman Projektion
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Exemplary flashcards for OC - Theorie at the Universität Wien on StudySmarter:

Was bewirken Alkylreste (auf Elektronen bezogen)

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Was sind Radikale und Kationen?

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Bedingungen für die Hypokonjugation?

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Begründungen warum Alkylreste Radikale / Kationen stabilisieren ?
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Praktische Anwendung der Radikalchemie?

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Axialer Substituent

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Äquatorialer Substituent

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Wichtige Effekte in Cycloalkansystemen und was bewirken sie?
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Definition und Bedingungen für ein Stereozentrum

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Exemplary flashcards for OC - Theorie at the Universität Wien on StudySmarter:

OC - Theorie

Synperiplanare Konformation (Newman-Projektion)
Methyl + Methyl beinahe Deckung
-> energetisch am höchsten, ungünstigsten

OC - Theorie

Antiperiplanare Konformation(Newman Projektion)
Methyl + Methyl am weitesten voneinander entfernt
-> energetisch am niedrigsten, günstigsten

OC - Theorie

Newman Projektion
Zur Konformationsanalyse benutzt
-> syn-/antiperiplanar etc.

OC - Theorie

Was bewirken Alkylreste (auf Elektronen bezogen)
-verschieben Elektronendichte zu Elektronenmangelzentren (Radikale, Kationen)
—> positiv Induktiver Effekt : +I

OC - Theorie

Was sind Radikale und Kationen?
Elektronenmangelzentren

OC - Theorie

Bedingungen für die Hypokonjugation?
Synperiplanare Anordnung von pz und Sigma C,H / sigma C,C in alpha-Position

OC - Theorie

Begründungen warum Alkylreste Radikale / Kationen stabilisieren ?
- +I-Effekt (Elektronenverschiebung)
- Hypokonjugation (desto mehr Alkylreste, desto stabiler die Mangelzentren!)

OC - Theorie

Praktische Anwendung der Radikalchemie?
„Cracken“ : Erdölproduktion 
-> DB im Alken funktionelle Gruppe die dafür genutzt wird
1. Rekombinieren
2. Disproportionieren (bessere Variante)

OC - Theorie

Axialer Substituent
- senkrecht
- Wechselwirkungen
—> energetisch ungünstiger

OC - Theorie

Äquatorialer Substituent
- parallel zu Bindungen
- vom Ring weg
—> energetisch günstiger, bevorzugt

OC - Theorie

Wichtige Effekte in Cycloalkansystemen und was bewirken sie?
1. Pitzer Spannung : durch van-der-Waals Kräfte
2. Bayer Spannung: Energieerhöhung durch Winkeldeformation
—> 2 Faktoren für Spannung im Ringsystem!

OC - Theorie

Definition und Bedingungen für ein Stereozentrum
- Atom innerhalb eines Moleküls, das 4 unterschiedliche Substituenten hat
- tetraedische Anordnung (sp*3 hybridisiertes Zentrum!) 

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