Atmosphere argon

The sample should be liquid or in solution. It is pumped and nebulized in an argon atmosphere, then sent through a plasma torch that is, in an environment where the material is strongly ionized resulting from the electromagnetic radiation produced by an induction coil. Refer to the schematic diagram in Figure 2.8. 

Degradatiou. Heating of succinic acid or anhydride yields y-ketopimehc ddactone, cyclohexane-1,4-dione, and a mixture of decomposition products that include acetic acid, propionic acid, acryUc acid, acetaldeide, acrolein, oxaUc acid, cyclopentanone, and furane. In argon atmosphere, thermal degradation of succinic anhydride takes place at 340°C (123). Electrolysis of succinic acid produces ethylene and acetylene. 

The titanium tetrachloride should be clean, colorless, and free of hydrogen chloride. The checkers used material freshly distilled in an argon atmosphere. 

Since finely divided lithium floats on the surface of the solvent and will be in contact with the atmosphere in the reaction vessel, an argon atmosphere, rather than a nitrogen atmosphere, should be used to avoid formation of the insoluble reddish-brown lithium nitride. 

Tetrathiafulvalene [31366-25-3] M 204.4, m 122-124°. Recrystd from cyclohexane/hexane under an argon atmosphere [Kauzlarich et al. J Am Chem Soc 109 4561 1987]. 

Lithium/carbon cells are typically made as coin cells. The lithium/carbon coin cell consists of several parts, including electrodes, separator, electrolyte and cell hardware. To construct a coin cell, we first must prepare each part separately. Successful cells will lead to meaningful results. The lithium/carbon coin cells used metallic lithium foil as the anode and a carbonaceous material as the cathode. The metallic lithium foil, with a thickness of 125 pm, was provided by Moli Energy (1990) Ltd.. Idie lithium foil is stored in a glove-box under an argon atmosphere to avoid oxidation. 

The electrolyte used is 1 molar LiPF dissolved in a mixture of 30% ethyl carbonate (EC) and 70% diethyl carbonate (DEC) by volume. This electrolyte IS easy to use because it will self-wet the separator and eleetrodes at atmospheric pressure. The electrolyte is kept under an argon atmosphere in the glove-box. The moleeules of electrolyte solvents, like EC and DEC, have in-plane dimensions of about (4 A x 5 A) to (6 A x 7 A). These molecules are normally larger than the openings of the micropores formed in the region 3 carbons (Fig. 2) as described in section 5. 

Reaction of iV-(4-chlorobenzyl)-9-iodo-7-oxo-2,3-dihydro-7//-pyrido [l,2,3- /e]-l,4-benzoxazine-6-carboxamide and HC=CCH20H in the presence of Cu(I)I and (PPh3)2PdCl2 in Et2NH under argon atmosphere for 18h gave 9-(3-hydroxy-l-propynyl) derivative (01MIP2). 

A suspension of 37.3 g (0.1 mol) of 7/3-amino-3-methoxy-3-cephem-4-carboxylic acid hydrochloride dioxanate in 500 ml methylene chloride is stirred for 15 minutes at room temperature under an argon atmosphere and treated with 57.2 ml (0.23 mol) of bis-(trimethylsilyl)-acetamide. After 45 minutes the faintly yellow slightly turbid solution is cooled to 0°C and treated within 10 minutes with 31.2 g (0.15 mol) of D-Ct-amino-Ct-d, 4-cyclohexadienyl (acetyl chloride hydrochloride. Thirty minutes thereafter 15 ml (about 0.21 mol) of propylene oxide is added and the mixture is further stirred for 1 hour at 0°C. A cooled mixture of 20 ml of absolute methanol in 200 ml of methylene chloride is added within 30 minutes, after another 30 minutes the precipitate is filtered off under exclusion of moisture, washed with methylene chloride and dried under reduced pressure at room temperature. The obtained hygroscopic crystals of the hydrochloride of 7j3-[D-a-(1,4-cyclohexadienyl)acetylamino] -... 

Fig. 2.33 Potential difference Kbetween a redox electrode and a nickel electrode immersed in an alkali chloride melt 700°C, argon atmosphere ...

Aluminium can be deposited from complex organic solutions if sufficient precautions are taken, and such coatings are now being produced commercially in North America. Two of the systems on record are (1) aluminium trichloride and lithium aluminium hydride dissolved in diethyl ether used at 40°C and 50A/m, and (2) aluminium chloride, n-butylamine and diethyl ether used at 20°C and 970 A/m. Deposits of 0-010 mm can be obtained on mild steel or copper at 20°C and 970 A/m using aluminium-wire anodes and nitrogen or argon atmospheres. 

M f-BuLi in pentane (14.7 mL, 22 mmol) was added dropwise to a stirred solution of 8 (R = /-Bu 2.63 g, 10 mmol) in anhyd THF (40 mL) at — 80C under an argon atmosphere, and the mixture was stirred at — 80 C for 1 h. After the addition of sublimed sulfur powder (320 mg, 10 mmol), the mixture was allowed to warm to rt over a 2-h period with stirring, and then EtOH (10 mL) was added. The mixture was heated at 55 C with stirring for 2-4 h, poured into ice-water (lOOmL), and then the whole was extracted with Et20 (3 x lOOmL). The combined extract was washed with brine, dried (MgS04), and concentrated in vacuo, and the residue was chromatographed (silica gel, hexane) yield 0.54 g (25%). 

A mixture of metal-tree phthalocyanine (ABAB 50 mg, 0.027 mmol), anhyd Zn(OAc)2 -2H20 (50 mg, 0.27 mmol) and MeOCH2CH2OH/toluene (1 2, 10 mL) was heated at 120 C for 20 h under an argon atmosphere. The solution was then cooled and the product was purified by column chromatography (alumina, CHCl3/MeOH 4 1). A blue-green solid was obtained yield 45 mg (87%). 

Coelenterazine analogues are easily soluble in methanol like coelenterazine. When methanol is used, however, the methanol concentration in the regeneration mixture should not exceed 5%. If the use of methanol must be avoided, dissolve the coelenterazine analogue in water with the help of a trace amount of 1M NaOH. However, coe-lenterazines in alkaline condition are extremely unstable. Therefore, the solution must be made rapidly in argon atmosphere and added at once to the regeneration mixture containing apoaequorin. 

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