Fluorocarbon nitrogen

Young, J.A. Durrell, W.S. Dresdner, R.D. Fluorocarbon nitrogen compounds. VIII. Mono-, di-, tri-, and tetraacyl derivatives, oxadiazoles, and co-bromo acyl isocyanates. J. Am. Chem. Soc. 1962, 84, 2105-2109. 

Fluorocarbon nitrogen compounds—Tetraacylhydrazines s. 18, 503 Mercuric chloride HgCl2... 

Fluorocarbon nitrogen compounds Carboxylic acid bis(trifluoromethyl)amides from carboxylic acid chlorides... 

Dresdner R, Tlumac F, Young J (1960) Fluorocarbon nitrogen compounds. V. Nitrogen trifluoride as a reagent in fluorocarbon chemistry. J Am Chem Soc 82 5831-5834... 

Fluoroamines s. Difluoroamines Fluorocarbon nitrogen compounds s. Carboxylic acid bis(trifluoro-methyl)amides Fluorophosphites 19, 589 Formaldehyde (s. a. Amino-, Halogeno-, Hydroxy-methylation)... 

In early reaction systems (9,10,31,32) the vaporized hydrocarbon was combined with nitrogen in a reactor and mixed with a nitrogen—fluorine mixture from a preheated source. The jet reactor (11) for low molecular weight fluorocarbons was an important improvement. The process takes place at around 200—300°C, and fluorination is carried out in the vapor state. 

The thermal conductivity of a cellular polymer can change upon aging under ambient conditions if the gas composition is influenced by such aging. Such a case is evidenced when oxygen or nitrogen diffuses into polyurethane foams that initially have only a fluorocarbon blowing agent in the cells (32,130,143,190,191,198-201). 

Redistilled tetraethoxysilane containing less than 1 ppm chloride added to neutral 18 x 10 H water purged with nitrogen ia fluorocarbon bottles does not hydroly2e to a gel for over 6 months (10). Without special precautions, tetraethoxysilane hydroly2es to a gel ia - 10 d tetramethoxysilane... 

Oxidative reactions frequently represent a convenient preparative route to synthetic intermediates and end products This chapter includes oxidations of alkanes and cycloalkanes, alkenes and cycloalkenes, dienes, aromatic fluorocarbons, alcohols, phenols, ethers, aldehydes and ketones, carboxylic acids, nitrogen compounds, and organophosphorus, -sulfur, -selenium, -iodine, and -boron compounds... 

In contrast to the toxicity of these fluorinated oxygen and nitrogen-containing compounds, the products from trifluorinated methyl ketones and amines are reported to have low acute toxicities 62). The fluorocarbons are insoluble in water, alcohol, and hydrocarbons 38). 

Colorless gas or liquid with an odor like ether. The odor has also been described as sweet and reminiscent of bruised apples. Industrially, it can be found diluted with a variety of gases including carbon dioxide, fluorocarbon 12, and nitrogen. This material is hazardous through inhalation, and ingestion, and produces local skin/eye impacts. Exposure to high vapor concentrations or direct contact with liquid may cause burns to the eyes and skin. 

Mixtures of 25-30% fluorine diluted with nitrogen were used in this work. The gas mixtures were prepared in a secondary container. The appropriate polyether was dissolved either in perfluoro-2-butyl-THF (FC-75) or in Krytox GPL 100 (a fluorinated oil), which also contained about 5 g of pulverized NaF to absorb the relased HE The reaction mixture was cooled to - 10°C, stirred with the aid of a vibromixer and irradiated with a 450-W medium-pressure mercury lamp. A stream of fluorine in nitrogen (ca. 140 ml/min) was passed into the mixture such that the temperature did not rise above +10°C. The reaction was stopped after 200 mmol of fluorine had been passed through. The mixture was poured into water and the organic layer was washed with sodium bicarbonate solution. The water layer was extracted twice with CFCL. The combined fluorocarbon fractions were washed with water, dried with MgS04, and filtered, and the solvent was removed under reduced pressure. 

The products of the electrochemical perfluorination of aromatic and heteroaromatic compounds are the corresponding perfluorinated cyclic and heterocyclic alkanes.28 and also per-fluorinated derivatives of the heteroaromatic compounds. Perfluorocyclohexane is the principal product from the electrochemical fluorination of benzene and fluorobenzene. Chloro derivatives of perfluorocyclohexane are produced from chlorobenzenes. Anisoles give fully saturated per-fluoro ethers, together with cleavage products. Extensive cleavage is observed in the fluorination of benzenethiols. Chloropyridines, fluorocarbons and sulfur hexafluoride or nitrogen trifluoride are characteristic byproducts from the above scries of reactions. 

In this way an equilibrium is maintained between the three forms of oxygen, O, 02 and 03. This equilibrium can be upset by chemical species which are carried to the upper atmosphere, specifically nitrogen oxides and chloro-fluorocarbons. 

For cryogenic freezing, nitrogen is used in several forms—as a shower of liquid droplets, as a liquid bath for direct immersion, or as a cold gas. Carbon dioxide is used as a liquid or in solid snow" form. When used in a tunnel for 1QR applications, liquid carbon dioxide can freeze products at a temperature from -62 lo -78°C (-80 to 109°F). Fluorocarbons and halocarbons also have been used in conjunction with tunnel and spiral-type freezers thill are used in IQF methods. 

A carefully dried, 500-ml., three-necked, round-bottomed flask is fitted with a compact distillation head and condenser, a pressure-equalizing addition funnel, and a nitrogen gas inlet tube. TTie nitrogen passes out through the distillation head. If conventional stopcocks are used, they should be lubricated with fluorocarbon or silicone grease. 

These high-free-volume polymers also have unusual permeability characteristics with mixtures of condensable and noncondensable gases. For example, in the presence of as little as 1200 ppm of a condensable vapor such as the per-fluorocarbon FC-77 (a perfluoro octane-perfluoro decane mixture), the nitrogen permeability of PTMSP is 20 times lower than the pure nitrogen permeability [71], as shown in Figure 2.41. When the condensable vapor is removed from the feed gas the nitrogen permeability rapidly returns to its original value. The best... 

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