ChemInform Abstract: Thermolabile Hydrocarbons. Part 30. Thermal Stability and Heat of Formation of 1,1,2,2‐ (I) and 1,1,1,2‐Tetraphenylethane (III). Energy of Stabilization of Benzhydryl and Triphenylmethyl Radicals.

Thermochemical Properties of Triphenylalkanes and Tetraphenylmethane. Strain in Phenyl Substituted Alkanes

“…The standard enthalpies of formation ∆ f H m °(cr) of compounds A-C and E have been determinated by Coops et al (1947Coops et al ( , 1953 using combustion calorimetry. Two compounds measured by this group have been remeasured by Beckhaus et al (1990), and their new results were in acceptable agreement with those from Coops. Therefore the values ∆ f H m °(cr) from Coops et al (1947Coops et al ( , 1953 were taken into account for the calculation of the gaseous standard enthalpies of formation ∆ f H m °(g) of these compounds (Table 5).…”

“…The series of polyphenyl substituted alkanes has been studied by Coops et al (1947Coops et al ( , 1953, using combustion calorimetry, but the absence of the systematical investigation on enthalpies of sublimation for these compounds thwarted the interpretation of their thermochemical properties in the gaseous phase. Beckhaus et al (1990) measured some tetraphenyl substituted compounds. This limited set of thermochemical information fails to provide a reliable concept of strain and the prediction of enthalpies of formation of polyphenylalkanes.…”

Pyrolysis behavior and bonding information of coal — A TGA study

“…12a shows peak areas of the sub-curves of the coals except that of sub-curve 5 (decomposition of carbonates). It should be noted that the peak area is a direct measure of the mass-loss and is determined not only by the number of bonds that undergo cleavage [42] but also by the mass of volatile fragments generated from the bond cleavage. It seems that the areas of sub-curves 1 and 6 are small and are relatively less sensitive to changes in C%, in comparison to that of sub-curves 2, 3 and 4.…”

Strain Effects in Phenyl-Substituted Methanes. Geminal Interaction between Phenyl and the Electron-Releasing Substituent in Benzylamines and Benzyl Alcohols

“…It has also recently been suggested that benzyl radicals may play an important role in stimulating spontaneous ignition, in both diesel and petrol engines (Davis et al, 1998). Knowledge of the thermochemical properties of benzyl derivatives is necessary to determine the radical stabilization energies and strength of a C-C bond in these compounds (Beckhaus et al, 1990). In recent years considerable activity has taken place with respect to the determination of the enthalpies of formation of amines (Ribeiro da Silva, 1996Steele et al, 1996, Verevkin 1997a1998a;Verevkin et al, 1998) but with limited emphasis on benzyl-substituted species.…”