Hygroscopic amine

The hygroscopic amine oxide should be protected from... 

After the amine is removed, a single extraction with ethyl ether is sufficient to provide a 98% pure product ia ca 75% yield. Lithium borohydride is a hygroscopic, white powder that decomposes slowly at its melting poiat, evolving hydrogen. The heat of formation is —190 kJ/mol (—45.4 kcal/mol). 

Sodium Borohydride. Sodium borohydride [16940-66-2] is a thermally stable, white crystalline soHd that decomposes in vacuo above 400°C. The heat of formation is —192 kJ/mol (—45.9 kcal/mol). NaBH is hygroscopic and absorbs water rapidly from moist air to form a dihydrate that decomposes slowly to sodium metaborate and hydrogen. It is soluble in many solvents including water, alcohols, Hquid ammonia and amines, glycol ethers, and dimethyl sulfoxide. 

Liquid cycloahphatic amines and diamines have exacting purity and color standards. Almost all are sold to specification, not performance standards. Use as isocyanate precursors requites low water content criteria for these hygroscopic fluids, hence nitrogen blanketing is often specified for product sampling as well as storage and transport. 

Fig. 4. (a) Yam resistance in n-cm vs amount of antistatic agent on the yam. The agent is the ethyl sulfate salt of an amine, (b) Resistance vs amount of nonionic, hygroscopic agent on the yam. Dotted lines are calculated from the specific resistance of the dry bulk solution soHd lines are experimental yam... 

Choline base [123-41 -17, [(CH2)3NCH2CH20H] 0H, triniethyl(2-hydroxyethyl)-ammonium hydroxide, derives its name from bile (Greek chole from which it was first obtained. This so-called free-ch oline is a colorless, hygroscopic Hquid with an odor of trimethyl amine. The quaternary ammonium compound (1) choline [62-49-7] or a precursor is needed in the diet as a constituent of certain phosphoHpids universally present in protoplasm. 

Acetylcholine [51 -84-3] occurs as the bromide [66-23-9] (Pragmoline) and the chloride [60-31-1] (Acecoline). The chloride is a hygroscopic, crystalline powder. It is very soluble in cold water and alcohol but is practically insoluble in diethyl ether. It is decomposed by hot water and alkahes. Acetylcholine bromide can be prepared by direct reaction of trimethyl amine and P-bromoethyl acetate in benzene (42). 

Complexes of boron trifluoride and amines such as monoethylamine are of interest because of the very long pot lives possible. The disadvantages of these complexes are their hygroscopic nature and the corrosive effects of BF3 liberated during cure. 

Diethanolamine (DEA), 2,2 -iminodiethanol di( -ethyloxy)aniline. HN-(CH2CH2OH)2, MW = 105.1. Sp. gr. = 1.097. Flash point = 280 °F. Also used as an absorbent for acidic gases in petrochemical operations. Hygroscopic. Available as a 98.5+% alkyl amine commodity product from various international manufacturers, including Texaco Corporation. Commonly available through chemical distributors. 

Free amine 36 was isolated as a hygroscopic hydrate which was very difficult to dry in the solid state and required azeotropic drying using THF (expensive and time consuming). 

Titanium(IV) iodide is extremely hygroscopic. It dissolves in water with decomposition, and it fumes in air owing to hydrolysis. It forms 2 1 adducts with ammonia,7 pyridine,33 and ethyl acetate.34 With excess ammonia it undergoes ammo-nolysis to give ammonobasic titanium(IV) iodides.7 Analogous aminolysis reactions occur when titanium(IV) iodide is treated with an excess of primary or secondary amine.36 Titanium(IV) iodide is sparingly soluble in petroleum ether, moderately soluble in benzene, and even more soluble in chlorinated hydrocarbons and carbon disulfide. At elevated temperatures it... 

The analogue, t-butyl methyl iminodicarboxylate 25, is obtained by the reaction of methanol with t-butyl oxamate (24) in the presence of lead tetraacetate. Its stable non-hygroscopic potassium salt is converted into alkyl derivatives 26 by the action of alkyl halides such as butyl bromide, allyl bromide, propargyl bromide and ethyl bromoacetate. The products are hydrolysed by trifluoroacetic acid to salts of primary amines, whereas... 

White cubic crystals hygroscopic density 1.07 g/cm decomposes slowly at about 400° C in vacuum or in moist air soluble in water, decomposing and evolving hydrogen also soluble in alcohols, liquid ammonia, amines and pyridine. 

Red-violet hexagonal crystals hygroscopic density 2.64 g/cm decomposes on heating above 425°C also decomposes in water, evolving heat soluble in alcohol, acetonitrile and certain amines insoluble in hydrocarbons and ether... 

Sorbitol is not flammable, corrosive, or volatile. In the absence of catalysts, sorbitol is stable in air, but the bulk material is hygroscopic and should be stored in an airtight container. Sorbitol does not darken or decompose at elevated temperatures or in the presence of amines. 

Lamm Explosives. Lamm patented, in 1888 in Fr, the use of waxes, such as carnauba, as coating agents for hygroscopic ingredients of expls. He also proposed several expl mixts contg DNB in combination with K or Amin nitrates... 

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