2-Trichlormethylbenzimidazol (TCMB) in der analytischen Chemie

Name: 2-Trichlormethylbenzimidazol (TCMB) in der analytischen Chemie
Brand: Verlag Unser Wissen
SKU: 9786209881145
Price: 5440.0 INR
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by Leszek Konopski

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ISBN13: 9786209881145
Binding: Paperback
Subject: N/A
Publisher: Verlag Unser Wissen
Publisher Imprint: Verlag Unser Wissen
Publication Date: May 18, 2026
Pages: 56
Original Price: GBP 43.0
Language: German
Edition: N/A
Item Weight: 87 grams
BISAC Subject(s): General

About The Book

Es wird ein �berblick �ber die Anwendungen von 2-Trichlormethylbenzimidazol (TCMB) in der analytischen Chemie gegeben. Es wurde unerwartet festgestellt, dass das farblose TCMB bei Raumtemperatur heftig mit Pyridin reagierte und dabei stark gef�rbte Produkte ergab. Bei Reaktionen mit einigen anderen stickstoffhaltigen Heteroaromaten (einschlie lich Pestiziden) wie Azinen, Azolen oder Benzazolen kam es ebenfalls zur Bildung �hnlicher Produkte. Die Reaktion war regioselektiv, da die beiden α-Positionen neben dem/den Stickstoffatom(en) nicht substituiert sein d�rfen, und empfindlich. Die Versuche, Dosimeter f�r Nikotin zu entwickeln, schlugen jedoch fehl. In einer pr�chromatographischen Reaktion von aromatischem o-Diamin mit Methyltrichloracetimidat wurden TCMB-Derivate in situ gebildet. Nach anschlie ender D�nnschichtchromatographie (TLC) und Visualisierung in Pyridind�mpfen wurde dies zum Nachweis von o-Phenylendiaminen eingesetzt. Das amaranthfarbene Reaktionsprodukt von TCMB und Pyridin (LI-Komplex) wurde isoliert und identifiziert. Es wurden zwei verschiedene Reaktionsmechanismen f�r Azine und Azole vorgeschlagen. In Wasser kann der LI-Komplex als Indikator bei der Analyse anorganischer Salze und bei S�ure-Base-Titrationen eingesetzt werden. Die Arbeit richtet sich an Forscher und Studierende der organischen oder analytischen Chemie.

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