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Download Organic Syntheses: v. 40 by Melvin S. Newman PDF

By Melvin S. Newman

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1 Katalytische Hydrierung der Alkene Alkene addieren in Gegenwart von Metallkatalysatoren (Ni, Pd, Pt) quantitativ Wasserstoff an ihre CC-Doppelbindung. Dabei addiert das H2-Molekül an eine Seite der CC-Doppelbindung. R Alken R katalytische Hydrierung R R H H R R C C R H H C C R Alkan Katalysator-Oberfläche (Katalysator = Ni , Pd oder Pt) Beispiel: H 3C CH 3 H 3C CH3 Ni, Pd oder Pt + H2 C C H 3C CH CH CH 2 CH2 CH2 CH 2 CH 3 CH 2 CH2 CH2 CH 2 CH 3 CH 3 2,3-Dimethyl-2-octen 2,3-Dimethyloctan Da es viele Verfahren zur Synthese von Alkenen gibt (Abschn.

Stab-, Kugel-Stab- und Kalotten-Modell des Ethins Die lineare Molekülgeometrie wird erklärt, indem die bindenden C-Atome sp-Hybridorbitale bereitstellen, deren Endüberlappung zu einem u-Molekülorbital (sp-sp-u-MO) und damit zur CC-sBindung des Ethins führt. An jedem C-Atom bleibt dann noch ein sp-Orbital, welches mit dem Wasserstoff-1s-Orbital zum CH-u-Orbital (sp-sp-u-MO) überlappt. Die seitliche Überlappung der beiden an jedem C-Atom noch verfügbaren 2p-Orbitale (Abb. 19) erzeugt zwei r-Molekülorbitale (p-p-r-MO), deren r-Elektronenwolken die CC-u-Bindung oben und unten sowie vorn und hinten umschließen (Abb.

Ethin-Molekül, (a) lineare Geometrie und Atomabstände, (b) Überlappung der p-Orbitale zu zwei rMolekülorbitalen Aus E. Breitmaier, G. Jung: Organische Chemie (ISBN 3-13-541505-8) © Georg Thieme Verlag Stuttgart 2005 Dieses Dokument ist nur für den persönlichen Gebrauch bestimmt und darf in keiner Form an Dritte weitergegeben werden! 8 Reaktive Zwischenstufen 15 Eine CC-Dreifachbindung besteht also aus einer CC-u-Bindung und zwei CC-r-Bindungen, welche aus der Überlappung von zwei Paaren senkrecht aufeinander stehender 2p-Orbitale resultieren.

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