## 3 Results and Discussion
### Vapour Pressures and Vaporisation/Sublimation Enthalpies of Alkylbenzenes
\begin{table}
\begin{tabular}{l l l l l l} \hline
**Compound** & **M \({}^{\text{a}}\)** & **\(T\)-Range** & \(\Delta_{\text{cr}}^{\text{S}}H_{\text{m}}^{\text{o}}(T_{\text{av}})\) & \(\Delta_{\text{cr}}^{\text{S}}H_{\text{m}}^{\text{o}}(298.15\text{ K})\)\({}^{\text{b}}\)** & **Ref.** \\ \hline CAS & & K & kJ\(\cdot\cdot\)mol\({}^{-1}\) & kJ\(\cdot\cdot\)mol\({}^{-1}\) & \\ \hline
1,_A_-di-tert-butylbezene & S & 285.0-325.0 & 83.2 \(\pm\) 1.5 & 83.4 \(\pm\) 1.6 & [37] \\  & T & 288.2-333.2 & 82.2 \(\pm\) 0.8 & 82.6 \(\pm\) 0.9 & [10] \\  & SC & & 81.3 \(\pm\) 2.0 & [38] \\  & T & 314.3-340.5 & 81.3 \(\pm\) 0.8 & 82.3 \(\pm\) 1.1 & Table S1 \\  & PhT & & & 81.7 \(\pm\) 0.6 & Table 4 \\  & & & & **82.1 \(\pm\) 0.4 c** & \\ \hline
1-methyl-3,5-di- & T & 274.7–301.7 & 82.4 \(\pm\) 1.0 & 81.9 \(\pm\) 1.1 & [10] \\ tert-butylbezene & SC & & & 81.8 \(\pm\) 2.0 & [38] \\  & PhT & & & 80.7 \(\pm\) 0.6 & Table 4 \\  & & & **81.0 \(\pm\) 0.5 c** & \\ \hline
1,3,5-tri-tert-butylbenzene & K & 273.2–315.2 & 79.8 \(\pm\) 0.8 & 79.5 \(\pm\) 0.9 & [39] \\  & T & 297.7–341.3 & 79.9 \(\pm\) 0.6 & 81.2 \(\pm\) 0.7 & [10] \\  & SC & & & 82.7 \(\pm\) 2.0 & [38] \\  & & & & 79.8 \(\pm\) 0.8 & \\  & & & **80.4 \(\pm\) 0.4 c** & \\  & & & & **80.4 \(\pm\) 0.4 c** & \\ \hline \end{tabular} \({}^{\text{a}}\) Methods: T = transpiration method; SC = method based on solution calorimetry; S = static method; PhT = calculated as the difference of phase transitions (see Table 4); K = Knudson effusion method; b Vapour pressures available in the literature were treated using Equations (3)–(5) with the help of heat capacity differences from Table S1 to evaluate the enthalpy of sublimation at 298.15 K. Uncertainties in the sublimation enthalpies \(U(\Delta_{\text{cr}}^{\text{S}}H_{\text{m}}^{\text{o}})\) are the expanded uncertainty (0.95 level of confidence). They include uncertainties from the fitting equation and uncertainties from temperature adjustment to \(T\) = 298.15 K. Uncertainties in the temperature adjustment of sublimation enthalpies to the reference temperature \(T\) = 298.15 K are estimated to account for 20% to the total adjustment; c Weighted mean value (uncertainities were taken as the weighting factor). Values in bold are recommended for further thermochemical calculations.  
\end{table} 
Table 3: Compilation of the enthalpies of sublimation, \(\Delta_{\text{cr}}^{\text{S}}H_{\text{m}}^{\text{o}}\) for the tert-butyl-benzenes derives determined in this work and from the data available in the literature. transpiration measurements were intentionally made in the ranges near \(T\) = 298.15 K to reduce the influence of the \(\Delta^{\rm g}_{\rm cr,l}C^{\rm o}_{p,\rm m}\) fluctuations on the target property \(\Delta^{\rm g}_{\rm I}H^{\rm o}_{\rm m}\)(298.15 K). At long last, our efforts to evaluate specific \(\Delta^{\rm g}_{\rm cr,l}C^{\rm o}_{p,\rm m}\)-values have helped to reconcile the vaporisation/sublimation enthalpies measured using different methods in significantly different temperature ranges with final results that agree very well for each alkylbenzene under study. One of the best examples of this perfect match is 1,4-di-tert-butylbenzene, where transpiration, static and ebulliometry results differ by less than 1 kJ-mol\({}^{-1}\) (see Table 2). Good agreement at a similar level was obtained for other di- and tri-alkyl substituted alkylbenzenes, which are summarized in Tables 1-3.