£46.99

VS Verlag für Sozialwissenschaften Metallorganische Synthesen heterocyclischer Systeme: Polyarene; Heterocyclen ― Synthesen über Arine: 2450 (Forschungsberichte des Landes Nordrhein-Westfalen, 2450)

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Description

2. Seitenkettencyclisierung an Heteroarenen liber HeteroK arin-Zwischenstufen 55 2.1 tiber 3,4-Dehydropyridin-Derivate 55 2.2 Versuche an Imidazol-Derivaten 59 2.3 Versuche an Pyrazol-Derivaten 62 3. ~Cycloadditionsreaktionen mit Arinen 64 68 Teil D: Literatur 69 •• 11::_==1:1:11: - 3 - Teil A: Pollarene [1] ===-===== 1. Einleitung Aromatische Ringsysteme konnen, wie die in der Literatur beschriebenen Verbindungen 2 [2] und ~ [3] zeigen, uber Einfachbindungen zu langeren Ketten oder Makrocyclen ver= knupft seine Fur Verbindungen des Typs 2 und 2 haben wir die allgemeinen Bezeichnungen Polyarene [4] bzw. Cyclo: polyarene [5] vorgeschlagen, da die IUPAC-Nomenklatur (Regel A-51 [6]) nur die ganz unspezifische und fur zu. sammengesetzte Namen ungunstige allgemeine Bezeichnung "Ringensembles" (angelsachsisch: ring assemblies) an .. bietct (vgl. 2.). 2 Fur die Synthese von Polyarenen und Cyclopolyarenen gibt es zwei grundsatzlich verschiedene Verfahren, namlich a) Ringverknupfende Synthesen b) Ringbildende Synthesen In der vorliegenden Arbeit werden ausschliefilich Synthesen des ersten Typs beschrieben. Ringbildende Polyaren-Synthe= sen - die formulierte Synthese von 2 ist ein Beispiel [7] - haben in letzter Zeit in der makromolekularen Chemie ("Ringbildende Polymerisationen" [8]) Bedeutung erlangt, da so zugangliche Polymere hohe thermische Stabilitat be: sitzen. fl T - - 4 - Als Methode fur die Verknupfung aromatischer Systeme zu Polyarenen stand bis vor kurzem die Ullmann-Reaktion [9], die Umsetzung von Organolithiumverbindungen (oder Organo:: magnesiumhalogeniden) mit Kupferhalogeniden (oxidative Kupplung) [10] sowie die Kupplung von Arylkupferverbindun~ gen mit Arylhalogeniden [11] im Vordergrund. Eine gewisse Bedeutung erlangte auch die Dimroth-Reaktion [12].

Product Specifications

Format
paperback
Domain
Amazon UK
Publication Date
01 January 1975
Listed Since
27 March 2013

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