Metal liquid reagents, attack

The corrosion inhibitors appear to possess properties that impart to metals resistance to attack by a variety of corrosive agents, such as brines, weak inorganic acids, organic acids, COj, HjS, etc. The method of carrying out this process is relatively simple in principle the corrosion preventive reagent is dissolved in the liquid corrosive medium in small amounts and is thus kept in contact with the metal surface to be protected. Alternatively, the corrosion inhibitor may be applied first to the metal surface, either as it is or as a solution in some carrier liquid or paste. Continuous application, as in the corrosive solution, is the preferred method, however. The concentration of the corrosion inhibitors varies widely, but the preferable concentrations are 15-250 ppm. 

The less hindered f/ans-olefins may be obtained by reduction with lithium or sodium metal in liquid ammonia or amine solvents (Birch reduction). This reagent, however, attacks most polar functional groups (except for carboxylic acids R.E.A. Dear, 1963 J. Fried, 1968), and their protection is necessary (see section 2.6). 

The acid is rather feeble, but it reddens litmus,2 decomposes carbonates and neutralises alkalis with the formation of salts. The baser metals are also slowly attacked, and the liquid finds frequent use as an etching reagent in the metallographic examination of alloys.3... 

Allylic sulfoxides and sulfones are completely metallated in liquid ammonia by all alkali amides [1]. For metallation in organic solvents, LDA and BuLi are usually applied. The lithiation of allyltrimethylsilane can be conveniently achieved with BuLi TMEDA (or HMPT) or f-BuLi TMEDA (or HMPT) in THF-alkane mixtures [3], As in the case of the sulfur compounds, extension of the unsaturated system leads to an increased acidity. Thus H2C=CHCH=CHCH2SiMe3 can be metallated with the less strongly basic LDA in THF [4], For the metallation of allylic selenides, LDA seems to be the reagent of choice. Butyllithium will presumably attack on selenium. 

Solubility Characteristics Soluble in ethanol and cosmetic oils. Chemically stable compounds that are not attacked by reagents. Excellent surface binding and very good spreading properties Form Supplied Clear odorless and tasteless liquids. Noncorrosive. Inert in the presence of metals and plastics... 

The high electronegativity of the nitrogen atom activates the monomer toward attack by carbanions. The polymerization can be initiated by carbanions [571] by electron-transfer initiators [573] electrochemically [574] by sodium in liquid ammonia [575] by a Grignard reagent [576] by magnesium, beryllium, and lithium compounds [577,578] or by transition metal allyl compounds [579]. 

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