Tables of melting points

Appendix III lists the melting points of many common polymers. More complete tables of melting points and heats of fusions may be found in Refs. 4, 38, 140, and 141. 

Problem 11.32 Arrange the isomeric letramethylbenzenes, prehnitene (1,2,3,4-) and durene (1,2,4,5-), in order of decreasing melting point and verify this order from tables of melting points. ... 

Tables of melting points and/or boiling points of furoxans3 and their fused derivatives3,6 have been published. Among other thermochemical measurements, the heats of combustion have been the most widely investigated. Early work of Milone122 compared heats of combustion for aryl methyl furoxan and peroxide isomers (now known to be 4-aryl-3-methyl and 3-aryl-4-methyl furoxans, respectively85). The latter were found to be considerably the more exothermic, by 33kJmol 1, which is at variance with the finely balanced equilibria between the isomers (Section V,B) (although these were measured in solution, and heats of solution have not been compared). More recently, the heats of combustion of dimethylfuroxan,123 benzo-...

The exact orientation about the ring is given to us by the physical data. The accompanying table of melting points tells us that compound A must be p-aminobenzoic acid,... 

A table of melting points and boiling points appears at the end of this exercise.)... 

Below is a table of melting points, boiling points, and a summary of substances required, tolerated, and forbidden in the three reactors. 

For convenience, classes of compounds are arranged in the same order in the chapters dealing with classification and preparation of derivatives as well as in the tables of melting points. 

The tables of melting points have been compiled from munerous works of reference and original papers and care has been taken to ensure that they are fully sufficient for student needs. 

In the following table of melting points, entries are alphabetical according to the basic structure of the polymer, ignoring substituents. Substituted polymers are listed alphabetically (according to the substituent) under the entry for the unsubstituted polymer. The moleeular weight is that of the chemical repeat (the constitutional base unit) in the polymer. Melting points (in C) are taken... 

The bulkiness of the substituent groups increases moving down Table 4.2. Also moving down the table, the melting points decrease, pass through a minimum, and then increase again. As is often the case with reversals of trends such as this, there are two different effects working in opposition in these data ... 

Molten cryohte dissolves many salts and oxides, forming solutions of melting point lower than the components. Figure 1 combines the melting point diagrams for cryolite—A1F. and for cryohte—NaF. Cryohte systems ate of great importance in the HaH-Heroult electrolysis process for the manufacture of aluminum (see Aluminumand ALUMINUM alloys). Table 5 Hsts the additional examples of cryohte as a component in minimum melting compositions. 

Table 1. Melting Points of Some Hydantoin Derivatives ...

Table 4. Melting Points of the Full Methyl Esters of Benzenepolycarboxylic Acids...

Batchwise fractional distillation can be used to adjust the ratio of isomers in the mixture. For example, the heat-transfer composition of Table 4 is obtained by collecting all of the ortho- some of the meta- and excluding most of the i ra-terphenyl present in the natural mixture. Economics and considerations of melting point depression favor inclusion of lower melting quaterphenyl isomers. 

Table 2 Melting Points (Boiling Points) of Various A -Isoxazoline Derivatives (62HC(i7)i, p. 95>...

The major difference between the two gluco-alkaloids and also between the two aglycones, lies in their melting-points and those of their derivatives. For convenience of comparison these are summarised in the following table, which includes mixed melting-points to illustrate the difficulty met with in this series, that a mixture of two distinct members of the group may not show depression of melting-point. 

Tire purpose of this chapter is to review the chemistry of the nitro-1,5-, -1,6-, -1,7-, and -1,8-naphthyridines (1) [nitro-2,6- and nitro-2,7-naph-thyridines (2) are unknown], with special attention to the results obtained in the laboratories of both authors. Tliis article mainly refers to the synthesis and reactivity of the nitronaphthyridines their physical and spectroscopic properties and biological activity are only covered briefly. For the convenience of the reader a table listing melting points of (di-)nitronaph-thyridines and some derivatives is included (Table III). Tire literature to about 1998 has been covered. 

Table 9. Melting points and reaction temperatures of Mf203 with NbOiF...

Table 49. Melting points of some niobium-containing fluoride compounds...

As shown earlier, the melting point for perfectly linear ADMET polyethylene (Table 8.1) approaches the range of melting point values exhibited by industrially produced, highly linear polyethylenes.40 However, for ADMET polyethylene with a methyl branch placed on every ninth carbon, the 7m is lowered significantly. The melting point of — 14°C and enthalpy of 28 J/g is 150°C and approximately... 

TABLE 2 Melting Points of Alkylsulfuric Acids and Their Base Alcohols... 

TABLE 3 Melting Points of Alcohol and Alcohol Ether Sulfates... 

Table 7. Melting Points of NIR-Absorbing Fluoran Compounds (81)...

---