By considering both C1s CEBEs and 13 C-NMR chemical shifts together, one can gain a more comprehensive understanding of the molecular structure and environment of carbon atoms within a compound. For instance, if a particular carbon atom exhibits a high C1s ionization energy and a corresponding downfield shift in the NMR spectrum, it suggests that the carbon is in a relatively electron-deficient environment, potentially surrounded by electron-withdrawing groups or participating in strong bonding interactions. C1s CEBEs and 13 C-NMR chemical shifts are both sensitive to the local chemical environment around carbon atoms, and both techniques provide valuable information about the electronic structure, molecular connectivity, and bonding properties of carbon-containing compounds . The chemical environment, including nearby atoms, electronegative or electron-donating groups, and bonding characteristics, influences both the magnetic field experienced by carbon nuclei in C-NMR and the electronic interactions of carbon core electrons in C1s XPS [70]. Therefore, by jointly utilizing C1s core ionization energies and 13 C-NMR chemical shifts, one can obtain complementary molecular structural information, allowing for a more comprehensive characterization of the chemical environment surrounding carbon atoms in a given compound. This integrated approach enhances the understanding of molecular structure and facilitates the interpretation of complex chemical systems. oxidation. Additionally, bridge carbons, present in strained hydrocarbons, display relatively low reactivity due to their shielding effects, making them more challenging to oxidize [71].