Establishing a reasonable multidimensional potential energy surface (PES) for this exponential problem is a computational challenge compared to the 1D case. For this reason, most studies have focused either on systems that are decoupled or where superposition of one-dimensional hindered rotations (N ×1DHR) is an appropriate approximation. In the case of n-alkanes, Vansteenkiste et al. observed that a superposition of one-dimensional hindered rotations (1DHRs) is a good approximation for N -dimensional coupled hindered rotor (N DHR) because of fortuitious error cancellation. Similar works by the same group and Kopp et al. found out that N ×1DHR is a good improvement over RRHO and can already capture a substantial portion of anharmonicity despite its neglect of coupling that circumvents the curse of dimensionality. In addition, the efficient generation of 1D-PESs that can be used for N ×1DHR is a necessary first step to enable efficient generation of multidimensional PESs and leads to usable approximations to the N DHR problem.