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It is written as Al(Hg) in reactions. [1] Al(Hg) may be prepared by either grinding aluminium pellets or wire in mercury, or by allowing aluminium wire to react with a solution of mercury(II) chloride in water. [2] [3] [1] This amalgam is used as a chemical reagent to reduce compounds, such as of imines to amines. The aluminium is the ultimate ...
This amalgam is used as a reagent to reduce compounds, such as the reduction of imines to amines. The aluminium is the ultimate electron donor, and the mercury serves to mediate the electron transfer. [5] The reaction itself and the waste from it contain mercury, so special safety precautions and disposal methods are needed.
Reductive desulfonylation is typically accomplished with active metals or salts (sodium amalgam, aluminium amalgam, magnesium, samarium(II) iodide), tin hydrides (tributyltin hydride), or transition metal complexes with reducing agents or nucleophiles (PdCl 2 (dppp)/LiHBEt 3, Pd(PPh 3) 4 /LiHBEt 3, Pd(PPh 3) 4 /NaHC(CO 2 Et) 2). Alkyl, alkenyl ...
Amalgam is used most commonly for direct, permanent, posterior restorations and for large foundation restorations, or cores, which are precursors to placing crowns. [11] The reaction between mercury and alloy when mixed together is termed an amalgamation reaction. [14]
The nature of low-valent titanium species formed is varied as the products formed by reduction of the precursor titanium halide complex will naturally depend upon both the solvent (most commonly THF or DME) and the reducing agent employed: typically, lithium aluminum hydride, zinc-copper couple, zinc dust, magnesium-mercury amalgam, magnesium ...
Aluminium has a high chemical affinity to oxygen, which renders it suitable for use as a reducing agent in the thermite reaction. A fine powder of aluminium reacts explosively on contact with liquid oxygen; under normal conditions, however, aluminium forms a thin oxide layer that protects the metal from further corrosion by oxygen, water, or ...
Let the vial rest for two or three minutes. Immediately after this, several small filaments will visibly arise perpendicularly from the little bulb of the amalgam, which will grow and thrust out small branches in the form of a tree. The ball of amalgam will grow hard, like a pellet of white earth, and the little tree will be bright silver in color.
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