Naphthalenes physical constants

Physical constants of several partially fluorinated biphenyls (up to the 2,2, 3,4, -5,5, 6-heptafluoro-compound), obtained by a range of classical methods including the Friedel-Crafts, Ullmann, and Balz-Schiemann reactions, have been reported, and 1,8-difluoro- or 1,4,5-trifluoronaphthalene may be obtained by conventional routes (nitration, reduction, diazotization) from 1,8-diamino- or 1,5-difluoro-naphthalene, respectively. ... 

Entry no. 2 of Table 16 introduces the most remarkable aspect of Co(III) chemistry, namely its ability to oxidize non-activated C—H bonds (for a recent study, see Jones and Mellor, 1977) and we immediately see that Marcus theory here completely rules out the possibility of an initial electron-transfer step. This is predicted to be ca. 1016 times slower than what is actually observed. On the other hand, the theory correctly predicts the rate constant for oxidation of naphthalene under the same conditions, and the postulated direct abstraction of a 7t-electron is thus feasible (Cooper and Waters, 1967). The Co(III) trifluoroacetate study of entry no. 3, including only substrates without an alkyl side-chain, however, cannot be fitted to any physically realistic set of E°, A parameters. With E° = 1.83 V (value in 1.0 M HC104) A ought to be ca. 40 kcal mol-1 and the slope of the log k/AG0 regression line ca. —0.6 the A value is then in reasonable agreement with the estimated one but not the slope. With E° = 3.2 V (clearly not a physically very realistic standard potential) a A value of ca. 80 kcal mol-1 is required. This seems to be far too large for such a system. 

In their study of association in ammonia + acetylene mixtures, Cheh, O Connell, and Prausnitz calculated the physical contribution to B12 from potentials that included hard-core as well as multipole interactions. The existence of vapour-phase complexes of ethylene with ammonia and methanol and of methanol with pentane has been inferred from virial coefficient data. King and co-workers have obtained association constants for COj with naphthalene, methanol, ethanol, and diethyl ether, and for HgO with CO2 and... 

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