TRIMETHYLAMINE 40% aqueous

Trimethylamine, aqueous solutions not more than 50% trimethylamine by mass 1297... 

TRIMETHYLAMINE, aqueous solutions not >50% trimethylamine, by weight pN 1297) PCH) see TLD500... 

Trimethylamine. Aqueous trimethylamine (usually supplied as the 25 per cent solution) is treated (Fig. 18) with solid sodium hydroxide in a flask A connected to a reflux... 

Trimethylamine, anhydrous Trimethylamine, aqueous sol n.. See Trimethylamine Trimethylamine sulfur trioxide CAS 3162-58-1 EINECS/ELINCS 221-614-7 Synonyms Sulfur trioxide trimethylamine complex... 

Trimethylamine aqueous solution or gas 66 8 Exposure temperature is maximum recommended service temperature Kynar Atochem... 

A solution of 10.0 g. (0.25 mole) of sodium hydroxide in 250 ml. of water is prepared in a 1-1. round-bottomed flask equipped with a reflux condenser and a mechanical stirrer. Twenty-five grams (0.065 mole) of N,N-dimethylaminomethylferrocene methiodide is added to the solution. The resulting suspension is heated to reflux temperature with stirring. At this point the solid is in solution. Within 5 minutes oil starts to separate from the solution and trimethylamine starts to come off. At the end of 3.5 hours, at which time the evolution of the amine has virtually ceased, the reaction mixture is allowed to cool to room temperature. The oil generally crystallizes during the cooling. The mixture is stirred with 150 ml. of ether until the oil or solid is all dissolved in the ether. The ether layer is separated in a separatory funnel and the aqueous layer is extracted with two additional 150-ml. portions of ether. The combined ether extracts are washed once with water and dried over sodium sulfate. 

C17-0066. For a 0.350 M aqueous solution of trimethylamine, N (CH ), do the following (a) Identify major and minor species, (b) Compute concentrations of all species, (c) Find the pH. (d) Draw a molecular picture illustrating the equilibrium reaction that determines the pH. 

At room temperature, trimethylamine, (CHsjsN, is a gas with a strong ammonia-like odour. Calculate [OH ] and the percent of trimethylamine molecules that react with water in a 0.22 mol/L aqueous solution. 

Abundant evidence has been gathered to show that pure alumina, prepared either from aluminum isopropoxide or aluminum nitrate and ammonia and calcined at 600-800°, has intrinsic acidic sites. Several physical methods have been used to study the acidity of alumina. Titration with butylamine (33), dioxane (34), and aqueous potassium hydroxide (35) as well as chemisorption of gaseous ammonia (35), trimethylamine (36), or pyridine (37) gave apparent acidity values which approximated those of silica-alumina. On the other hand, the indicator method for testing the acidity of solids as developed by Walling (3S) showed no indication of even weak acids (39, 40). 

The excess of trimethylamine was removed by washing the pinacol (R)-( )-2-(3-trimethylsiloxy-l-butene)boronate (5.0 g) in petroleum ether (50 mL) using 5% aqueous AcOH (10 mL), 4% aqueous NaHCOs (10 mL), and saturated aqueous Na2S04 solution. The aqueous phases were back extracted each time with petroleum ether (10 mL). The combined organic layers were dried over anhydrous MgS04, filtered, and the solvent was removed under reduced pressure to afford pure pinacol ( )-2-(3-trimethylsiloxy-l-butene)boronate (4.84 g). Co(N03)2 6H20 (20 mg, 0.069 mmol) was added to a stirred solution of pinacol (R)-( )-2-(3-trimethylsiloxy-l-butene)boronate (5.70 g, 21.1 mmol) in petroleum ether (130 mL). Freshly distilled SOCI2 (2.75 g, 23.1 mmol) was added, and... 

Phosphine reacts neither in aqueous solution nor direct with trimethylamine oxide. Also no reaction occurs on treatment of phosphine with pyridine oxide... 

A. (E>-(Carhoxyvinyt)tHmethylaimonium betaine. A 1-L, three-necked, round-bottomed flask Is equipped with a mechanical stirrer, dropping funnel, and thermometer. The flask 1s charged with 25.0 g (0.255 mol) of ethyl proplolate (Note 1), 14 mL of dichlororaethane and 440 mL of water. The mixture Is cooled to 5"C (Note 2) and 90 mL (0.35 mol) of an aqueous 25% solution of trimethylamine (Note 3) Is added under vigorous stirring over a period of 30 min. The reaction temperature remains between 0 and 5°C during the addition and then is allowed to warm to 25°C for 3 hr. The... 

An aqueous 25% solution of trimethylamine available from Aldrich Chemical Company, Inc. is used directly. 

Sulfur trioxide reactivity can also be moderated through the use of S03 adducts. The reactivity of such complexes is inversely proportional to their stability, and consequendy they can be selected for a wide variety of conditions. Whereas moderating S03 reactivity by adducting agents is generally beneficial, the agents add cost and may contribute to odor and possible toxicity problems in derived products. Cellulosic material has been sulfated with SCT—trimethylamine adduct in aqueous media at 0 to 5°C (16). Sulfur trioxide—triethyl phosphate has been used to sulfonate alkenes to the corresponding alkene sulfonate (17). Sulfur trioxide—pyridine adduct sulfates oleyl alcohol with no attack of the double bond (18). 

Carbohydrates. Carbohydrates (240—244) of any form are easily sulfated in the presence of solvent, using sulfating reagents such as S03 pyridine, S O,—t tie th i amine, S03—trimethyl amine, or chlorosulfonic acid—pyridine. As an example, starch (qv) is sulfated using SO,—trimethylamine at 0 to 5°C in aqueous media (16). Sulfated carbohydrate products find some use in industry as thickening agents. 

Because phenolic compounds are easily sulfonated, their sulfation must be accomplished with milder sulfating agents, eg, complexes of sulfur trioxide or chlorosulfonic acid with trimethylamine, dimethylformamide, pyridine, or dimethylaniline, in anhydrous or aqueous medium below 100°C (86-89). 

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