Methylamine properties

CAS 61788-62-3 EINECS/ELINCS 262-990-2 Synonyms Dicocoalkyl methylamine Classification Dialkyl methylamine Properties Cationic Uses Chemical intermediate for quat. ammonium derive., acid scavenger in petrol, prods. epoxy hardener, catalyst in mfg. of flexible PU foams surfactant industrial detergent chemical intermediate for mfg. of oil-sol. betaines and quat. ammonium salts in cosmetics... 

Isoprene [78-79-5] (2-methyl-1,3-butadiene) is a colorless, volatile Hquid that is soluble in most hydrocarbons but is practically insoluble in water. Isoprene forms binary azeotropes with water, methanol, methylamine, acetonitrile, methyl formate, bromoethane, ethyl alcohol, methyl sulfide, acetone, propylene oxide, ethyl formate, isopropyl nitrate, methyla1 (dimethoxymethane), ethyl ether, and / -pentane. Ternary azeotropes form with water—acetone, water—acetonitrile, and methyl formate—ethyl bromide (8). Typical properties of isoprene are Hsted in Table 1. 

Other preparative routes iaclude hydrogenation of succinonitdle in the presence of methylamine and hydrogenation of solutions of maleic or succinic acid and methylamine (82,83). Properties are Hsted in Table 3. l-Meth5i-2-pyrrohdinone is completely miscible with water, lower alcohols, lower ketones, ether, ethyl acetate, chloroform, and benzene. It is moderately soluble in aUphatic hydrocarbons and dissolves many organic and inorganic compounds. 

The term liquefied petroleum gas (LPG) is often used to describe those liquefied flammable gases that are derived from petroleum. The term LFG is preferred when the discussion applies to all liquefied flammable gases. It includes materials such as ethylene oxide, vinyl chloride, and methylamines, which behave similarly so far as their flashing and flammable properties are concerned. 

Properties of PS-A and PS-B (Shimomura, 1991b Shimomura et al., 1993b). Both PS-A and PS-B are colorless viscous liquid, and their absorption spectra resemble that of panal (Fig. 9.6). By NMR analysis and mass spectrometry, PS-A and PS-B are found to be 1-O-decanoylpanal and 1-O-dodecanoylpanal, respectively. As a minor component, 1-O-tetradecanoylpanal has also been isolated. PS-A and PS-B gain chemiluminescence activity when treated with the salt of primary amines (see below for the conditions). Taking the activity obtained with methylamine as 100%, the activities obtained with other amines were ethylamine, 38% ethanolamine, 10% propylamine, 20% hexylamine, 3% and decylamine, 1%. 

Mixtures of Methylamine Nitrate with Compounds which have Explosive Properties. A mixt with 70—80% AN is called Nitramite No 2 in Fr (Ref 2). When detond with 2g of MF in 30mm tubes it has a deton vel of 2550m/sec at a d of l.OOg/cc and3250m/sec at 1.25g/cc (Ref 2). Mixts of Methylamine Nitrate with AN, Ca nitrate, or Na nitrate form low melting eutectics which are castable expls (Ref 1). A soln of 200g of Methylamine Nitrate in 800 lbs of methyl ale is a useful fuel for turbojets (Ref... 

The first bipolar axis (DMSO/ethanol) accounts for the contrast between compounds with NO2 substitutions and those without. Compounds with a NO2 substituent systematically obtain higher scores on this bipolar axis than others. The second bipolar axis (methylenedichloride/ethanol) seems to produce an order of the substituents according to their electronic properties. To emphasize this point we have reproduced the log double-centered biplot again in Fig. 31.10. The dashed line near the middle separates the class of NO2 substituted chalcones from the other compounds. Further, we have joined substituents by line segments according to the sequence CF3, F, H, methyl, ethyl, I -propyl, t-butyl, methoxy, phenyl and di-methylamine. The electronic properties of these substituents vary progressively from electron acceptors to electron donors [ 11 ] in accordance with their scores on the second bipolar axis. 

Figure 4. shows the route from the high boiling residue of the direct synthesis to silicon carbo-nitride fibers. Methylchlorodisilanes and trichlorosilanes as additives are mixed in a specific ratio and react with methylamine and a small amount of ammonia to form an aminodisilane/oligosilazane. The subsequent polycondensation reaction of this mixture by heating to 250 °C yields a soluble and melt spinnable polysilazane. In comparision with the polysilane the properties of the polysilazane depend on the ratios of the disilanes/silanes and methylamine/ammonia and also on the reaction conditions. 

Methylamines, 12 112 16 355-370 chemical properties of, 16 357-360 commercial, 16 356t economic aspects, specifications, and uses for, 16 364-368 end uses of, 16 365 exposure limits for, 16 3641 as feedstocks, 16 357-359 health, safety, and toxicology of, 16 364 manufacture of, 16 360-363 manufacturing data for, 16 367t physical properties of, 16 356-357 production of, 16 300 products manufactured using, 16 366-367t... 

Adolph and Cichra synthesized a number of polynitroperhydro-1,5-diazocines and compared their properties with the powerful military explosive HMX. A type of Mannich condensation was used to form the 1,5-diazocine rings the condensation of ammonia and methylamine with formaldehyde and bis(2,2-dinitroethyl)nitramine (46) forming diazocines (47) and (48) respectively. 1,3,3,7,7-Pentanitrooctahydro-1,5-diazocine (47) is A-nitrated to 1,3,3,5,7,7-hexanitrooctahydro-l,5-diazocine (52) in near quantitative yield using mixed acid. 

It then becomes fairly easy to decide that methanol is not a strong acid, like nitric acid say, so that the pATa — 2.2 is unlikely to refer to its acid properties. Methylamine ought to be basic rather like ammonia, so the pATa value of 35 would appear well out of the normal range for bases and must refer to its acidic properties. In such cases, there appear to be very good reasons for continuing to use pATb values for bases unfortunately, however, this is not now the convention. 

In humans, brief exposure at 2 0-100 ppm is said to produce transient irritation of the eyes, nose, and throat. No symptoms of irritation are produced from longer exposures at less than 10 ppm. On the basis of the irritant properties of methylamine, it is possible that severe exposure may cause pulmonary edema. 

Some commonly used buffers, such as sodium and potassium phosphate, are incompatible with ELSD, but there are ready alternatives. For example, ammonium acetate has similar buffering properties to potassium phosphate, and ammonium carbonate, ammonium formate, pyridinium acetate, and pyridinium formate are options for different pH ranges. Typical mobile phase modifiers that do not meet the volatility criteria can be replaced by a wide variety of more volatile alternates. For example, phosphoric acid, commonly used as an acid modifier fo control pH and ionization, can be replaced by trifluoroacetic acid other acids that are sufficiently volatile for use with FLSD include, acetic, carbonic, and formic acids. Triethylamine, commonly used as a base modifier, is compatible with FLSD other base modifiers that can be used are ethylamine, methylamine, and ammonium hydroxide [78]. 

Evidently the non-aqueous phase may possess acidic or basic characters either in virtue of its own properties, e.g. nitrobenzene and aniline, or through the addition of small quantities of soluble acidic or basic substances, e.g. salicylic acid to salicylaldehyde or methylamine to nitrobenzene. 

Critical Properties. The critical temperature, pressure and volume for methylamine, nitrous oxide and their binary mixtures were experimentally determined and have been previously reported (34). The critical temperatures of the mixtures are intermediate between those of the pure components (Tc methylamine = 156.9°C Tc nitrous oxide = 36.5°C). The critical pressure goes through a maximum between the pure component values (Pc methylamine = 7.43 bar Pc nitrous oxide = 72.4 bar). The maximum (92.5 bar) is observed at about 46 wt.% methylamine content. The extraction conditions reported in the present study are all above the critical T and P of the fluids used. 

Fulminic acid can be regarded as the simplest oxime. A number of compounds with an oxime group C=NOH can form salts which possess initiating properties, for example salts of nitroformoxime (methylnitrolic acid) (I) which can be obtained in a known way by the action of nitrous acid on nitromethane. Salts of form-hydroxamic acid (II), particularly the mercuric salt, also possess initiating properties [66]. Formhydroxamic acid can be obtained by the action of hydroxylamine on formic acid esters or by oxidation of methylamine. 

Aliphatic amine chromates, for example methylamine chromate, manifest a more clearly defined explosive character. The properties of hexamethylenetetr-... 

Effects of solvation on zwitterion formation between methylamine and fom-aldehydewere studied by various solvation methods. The SM2/AM1 model predicted the expected zwitterionc minimum while SM3/PM3 failed to do so [127]. Calculations were performed with the use of AMSOL to account for solvation effects in the study of molecular properties and pharmacokinetic behavior of ce-tirizine, a zwitterionic third-generation antihistaminic. Results indicated that the folded conformation remains of low energy not only in vacuo but also in water solution [128]. 

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