Melting point table

Melting Point. Amino acids are soHds, even the lower carbon-number amino acids such as glycine and alanine. The melting points of amino acids generally He between 200 and 300°C. Frequentiy amino acids decompose before reaching their melting points (Table 2). 

Properties are furthermore determined by the nature of the organic acid, the type of metal and its concentration, the presence of solvent and additives, and the method of manufacture. Higher melting points are characteristics of soaps made of high molecular-weight, straight-chain, saturated fatty acids. Branched-chain unsaturated fatty acids form soaps with lower melting points. Table 1 Hsts the properties of some soHd metal soaps. 

Pyrazolesulfonic acids, like (493), have high melting points (Table 24) and probably exist as the zwitterions (497). They are very stable to hydrolysis and only afford pyrazolones at high temperatures. The replacement of the SO3H group by bromine has also been reported (B-76MI40402). Pyrazole-3-, -4- and -5-sulfonic acids react with phosphorus pentachloride to form sulfonyl chlorides. 

Syndiotactic materials are generally softer, tougher and more transparent than isotactic materials but exhibit similar melting points Table II. 6). 

Plot the melting points (Table 18.4) of the alkali metals versus atomic number. Predict the melting point for the element francium. Would you predict francium to be a solid or a liquid at room temperature ... 

Sheng Lieh Liu Melting Point Table of Organosilicons. Natural Science Council, Taipai, 1968. Of little use. 520 pp. 

When aniline (40) and benzaldehyde derivatives (41) are ground together at room temperature, their condensation reaction starts immediately usually with gentle heat production but without melting because azomethines have higher melting points (Table 15-9). By this method, azomethines (42) are obtained in quantitative yield [15]. 

Their optical rotations and melting points (Table 4.1) were very important in assigning the absolute configuration of the natural pheromone. The natural ketone 104 was dextrorotatory in hexane, and (35,115)-104 as well as (35,115)-104 showed positive rotations, while (3R,11R)- and (35,115 )-104 were levorotatory. 

The metals Li, Na, K and Rb are silvery-white, but Cs has a golden-yellow cast. All are soft, Li the least so, and the trend is consistent with their melting points (Table 10.1). The particularly low melting point of Cs means that it may be a liquid at ambient temperatures in some countries. 

In the case of relatively stable and crystalline 1,2-dioxetanes, which can be isolated by crystallization and elution chromatography on silica gel,36-40 the melting points (Tables I and II) have served as good criteria of purity. However, in some cases, e.g., derivatives (lu), (lx), (lab), (lac), (laf) and (lab), decomposition points are involved, which limits this criterion for purity and structure confirmation. Where liquid diox-etanes are obtained, purification other than column chromatography is not feasible because of the thermal lability of these materials. 

Sulphonamides are excellent derivatives for identification of sulphonic acids and are prepared via the sulphonyl chloride using usually ammonia, aniline or p-toluidine. Melting point tables are in many reference books. 

Utermark W. and Schicke, "Melting Point Tables of Organic Compounds" 2nd ed.. Interscience, New York,... 

The application of the procedure just outlined to lithium clusters leads to satisfactory values of the surface energy per atom b, in agreement with theoretical results obtained by more complicated methods and with experimental values for the liquid metal and the vapor pressure near the melting point (Tables 19 and 20). The values obtained for b satisfy the theorem of Wulff. For instance, for a cfc cuboctahedron bounded by (111) and (110) faces, one finds... 

For the alpha phase, the vapor pressure equation was derived by evaluating the solid and gas free energy functions at 25 K intervals from 8(X) to 1600 K and the transition temperature for the beta phase, at 20 K intervals from 1630 to 1810 K and the transition temperature and melting point and for the liquid phase, at 50 K intervals from 1850 to 3200 K and the melting point (Table 3). 

The vapor pressure equation for the alpha phase was obtained by evaluating the free energy functions of the solid and the gas at 25 K intervals from 875 to 1050 K and the transition temperature and for the beta phase at 25 K intervals from 1075 to 1200 K and the transition and melting points and for the liquid at 50 K intervals from 1250 to 3550 K and the melting point (Table 51). 

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