## 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 a** & **T-Range** & \(\Delta_{1}^{\mathbf{S}}H_{\mathbf{m}}^{\mathbf{O}}(T_{\mathbf{av}})\) & \(\Delta_{1}^{\mathbf{S}}H_{\mathbf{m}}^{\mathbf{O}}(298.15\) K) b & **Ref.** \\ \hline CAS & & K & kJ-mol\({}^{-1}\) & kJ-mol\({}^{-1}\) & \\ \hline tert-butylbenzene & & & & \(47.5\pm 0.4\) & [12] \\ \hline
2-methyl-tert-butylbenzene & \(I_{x}\) & & & \(50.9\pm 1.0\) & Table S6 \\
1074-92-6 & \(I_{x}\) & & & \(51.2\pm 1.0\) & Table S7 \\ \hline
3-methyl-tert-butylbenzene & T & 274.4-318.5 & 51.0 \(\pm\) 0.6 & \(51.1\pm 0.6\) & [12] \\
1075-38-3 & \(I_{x}\) & & & \(51.5\pm 1.0\) & Table S5 \\  & \(I_{x}\) & & & \(51.7\pm 1.0\) & Table S6 \\  & \(I_{x}\) & & & \(51.8\pm 1.0\) & Table S7 \\  & \(I_{x}\) & & & \(51.4\pm 0.4\) & Table S7 \\ \hline
4-methyl-tert-butylbenzene & T & 273.5–322.9 & 52.2 \(\pm\) 0.2 & 52.2 \(\pm\) 0.2 & [12] \\
98-51-1 & & & & \(52.6\pm 1.0\) & Table 5 \\  & & & & \(52.3\pm 0.3\) \({}^{\mathrm{c}}\) & \\ \hline
3,5-di-methyl-tert-butylbezene & S & 253.4–442.9 & 54.9 \(\pm\) 0.2 & 56.7 \(\pm\) 0.4 & [29] \\
98-19-1 & S & 273.7–442.9 & 53.4 \(\pm\) 0.1 & 56.3 \(\pm\) 0.7 & [31] \\  & T & 283.6–318.2 & 56.5 \(\pm\) 1.2 & 56.7 \(\pm\) 1.2 & [10] \\  & & & & \(56.6\pm 0.3\) \({}^{\mathrm{c}}\) & \\ \hline
1,2-di-tert-butylbezene & \(S_{x}\) & & & \(56.6\pm 1.5\) & Table 7 \\
1012-76-6 & & & & \(56.6\pm 1.5\) & Table 7 \\ \hline
1,3-di-tert-butylbezene & n/a & 346–374 & 58.0 \(\pm\) 1.0 & 61.6 \(\pm\) 1.2 & [32] \\
1014-60-4 & T & 288.3–333.1 & 58.9 \(\pm\) 1.0 & 59.6 \(\pm\) 1.1 & [10] \\  & E & 412.7–498.5 & 49.0 \(\pm\) 0.1 & 58.2 \(\pm\) 1.8 & [33] \\  & BP & 346.2–497.3 & 52.9 \(\pm\) 1.9 & 59.6 \(\pm\) 2.3 & Table S4 \\  & \(I_{x}\) & & & \(59.7\pm 1.0\) & Table S7 \\  & \(H_{\mathrm{ad}}\) & & & \(58.8\pm 1.0\) & Table 6 \\  & \(S_{x}\) & & & \(59.0\pm 1.5\) & Table 7 \\ \hline
1,4-di-tert-butylbezene & E & 377.0–510.0 & 52.1 \(\pm\) 0.2 & 60.7 \(\pm\) 1.7 & [34] \\
1012-72-2 & S & 353.6–463.1 & 54.4 \(\pm\) 0.2 & 60.6 \(\pm\) 1.2 & [31] \\  & E & 389.4–517.5 & 51.8 \(\pm\) 0.1 & 60.7 \(\pm\) 1.8 & [33] \\  & T & 354.2–383.3 & 56.3 \(\pm\) 0.9 & 60.5 \(\pm\) 1.2 & [35] \\  & T & 354.2–383.3 & 56.3 \(\pm\) 1.1 & 60.4 \(\pm\) 1.3 & [12] \\  & E & 350.0–510.4 & 53.8 \(\pm\) 0.1 & 60.9 \(\pm\) 1.6 & [36] \\  & T & 351.2–384.5 & 56.2 \(\pm\) 0.6 & 60.3 \(\pm\) 1.0 & Table S1 \\  & BP & 361.8–514.2 & 52.7 \(\pm\) 1.1 & 60.9 \(\pm\) 2.0 & Table S4 \\  & \(I_{x}\) & & & \(60.7\pm 1.0\) & Table S6 \\  & S\({}_{x}\) & & & \(59.3\pm 1.5\) & Table 7 \\  & & & & \(60.5\pm 0.5\) \({}^{\mathrm{c}}\) & \\ \hline
1-methyl-3,5-di- & T & 308.3–358.2 & 60.3 \(\pm\) 0.4 & 62.5 \(\pm\) 0.6 & [35] \\ tert-butylbezene & E & 379.6–510.6 & 53.2 \(\pm\) 0.2 & 62.9 \(\pm\) 1.9 & [35] \\
15181-11-0 & T & 308.9–338.3 & 61.1 \(\pm\) 1.8 & 62.7 \(\pm\) 1.9 & [35] \\  & BP & 410.2–511.2 & 51.6 \(\pm\) 1.0 & 62.0 \(\pm\) 2.3 & Table S4 \\  & & & & \(62.5\pm 0.5\) \({}^{\mathrm{c}}\) & \\ \hline
1,3,5-tri-tert-butylbenzene & S & 343.5–462.7 & 60.9 \(\pm\) 0.3 & 69.1 \(\pm\) 1.7 & [31] \\
1460-02-2 & E & 447.9–528.3 & 53.7 \(\pm\) 0.2 & 69.0 \(\pm\) 3.1 & [33] \\  & T & 352.2–382.7 & 63.1 \(\pm\) 0.5 & 68.7 \(\pm\) 1.2 & [35] \\  & T & 348.6–388.7 & 63.3 \(\pm\) 0.6 & 69.0 \(\pm\) 1.3 & Table S1 \\  & BP & 381.2–527.4 & 55.9 \(\pm\) 1.3 & 68.5 \(\pm\) 2.8 & Table S4 \\  & \(S_{x}\) & & & \(69.7\pm 1.5\) & Table 7 \\ \hline
1,2,4-tri-tert-butylbenzene & \(S_{x}\) & & & \(67.7\pm 1.5\) & Table 7 \\
1459-11-6 & & & & & \(64.8\pm 1.5\) & Table 7 \\ \hline
1,2,3-tri-tert-butylbenzene & \(S_{x}\) & & & \(64.8\pm 1.5\) & Table 7 \\
40782-34-1 & & & & & \(73.6\pm 1.5\) & Table 7 \\
796-97-4 & & & & & \(57.4\pm 1.0\) & Table 6 \\ \hline \hline \end{tabular}  
* \({}^{\mathrm{a}}\) Methods: T = transpiration method; E = ebuliometry; n/a = not available; \(I_{x}\) = from correlation of experimental vaporisation enthalpies with Kovats indices (see text); S = static method; BP = from boiling points at different \(I_{x}\).  
\end{table}