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The enthalpies of combustion and formation of 1,8-dimethyInaphthalene, 2,3-dimethylnaphthalene, 2,6-dimethylnaphthalene, and 2,7-dimethylnaphthalene

1973; Elsevier BV; Volume: 5; Issue: 5 Linguagem: Inglês

10.1016/s0021-9614(73)80012-6

1096-3626

W. D. Good,

Thermal and Kinetic Analysis

The enthalpies of combustion of 1,8-dimethylnaphthalene, 2,3-dimethylnaphthalene, 2,6-dimethylnaphthalene, and 2,7-dimethylnaphthalene were measured by precision oxygenbomb calorimetry. The following values, based on the mass of carbon dioxide produced, are reported for the standard enthalpy of combustion, ΔHoo(298.15 K)/kcalth mol−1, of these compounds in the crystalline state: 1,8-dimethylnaphthalene, -(1544.70 ± 0.25); 2,3-dimethylnaphthalene, -(1537.95 ± 0.21); 2,6-dimethylnaphthalene, -(1537.14 ± 0.38); and 2,7-dimethylnaphthalene, -(1537.21 ± 0.23).† None of these values would have been predicatable within experimental uncertainty, and a predicted value for 1,8-dimethylnaphthalene probably would have been different by 7 kcalthmol−1 from the experimental value.