Eine einfache und ergiebige Synthese für Bis(trimethylsilyl)- und Bis(trimethylgermyl)quecksilber / A Simple and High Yielding Synthesis for Bis(trimethylsilyl)- and Bis(trimethylgermyl)mercury

Abstract

<jats:title>Abstract</jats:title><jats:p> Bis (trimethylsily 1)mercury, Bis(trimethylgermy 1)mercury, Lithium-tris(trimethylsilyl)mercurate</jats:p>

Synthesis, Experimental/Theoretical Characterization, and Thermolysis Chemistry of CpBe(SiMe3), a Molecule Containing an Unprecedented Beryllium−Silicon Bond

“…Beryllium chloride was prepared by the passing of chlorine gas (AGA, 99.99%) over beryllium metal (99.9%, Aldrich) at 500−550 °C. Bis(trimethylsilyl)mercury was prepared by reaction of mechanically stirred lithium amalgam and trimethylchlorosilane in a slurry of sodium chloride, sodium iodide, and diethyl ether for 3 days in the dark; the resulting mercurial was then extracted in pentane and sublimed under high vacuum. Base-free trimethylsilyllithium was synthesized by addition of an excess of lithium powder (high sodium, 99%, Aldrich) to a stirred solution of Hg(SiMe 3 ) 2 in hexane.…”

Heterocyclic Carbenes: Synthesis and Coordination Chemistry

“…In addition, the deprotonation of cyclic six-membered formamidinium salts often leads to the isolation of alkali-metal adducts of the carbene as observed in the synthesis of 128 a. Bertrand et al developed a method for the preparation metal-free diaminocarbenes which is also suitable for the synthesis of cyclic diaminocarbenes of type 128. [229] In this synthesis 2-chloro-1,3-dimethyltetrahydropyrimidin-2-ium chloride is treated with bis(trimethylsilyl)mercury [230] resulting in dehalogenation of the N-heterocyclic ring to give the carbene 128 c (Scheme 64). In spite of the sterically less-demanding N-methyl substituents, carbene 128 c shows no tendency to dimerize.…”

Heterocyclische Carbene – Synthese und Koordinationschemie

“…haben daher eine alternative Synthesemethode für metallfreie Diaminocarbene entwickelt, die sich auch gut für cyclische Diamino‐Sechsringcarbene des Typs 128 eignet 229. Dazu wird 2‐Chlor‐1,3‐dimethyltetrahydropyrimidinium‐chlorid mit Bis(trimethylsilyl)quecksilber230 unter Bildung von 128 c dehalogeniert (Schema ). Das N‐heterocyclische Carben 128 c zeigt trotz der kleinen N‐Methylsubstituenten keine Tendenz zur Dimerisierung.…”