The δC of the ten carbons in the exo-TCD structures can be broadly divided into two groups: the shielded group (δC < 40 ppm), which includes C5 through C10. These carbons experience more shielded due to their positions in the molecular framework and the relative absence of electronwithdrawing groups or interactions with more electronegative atoms. The deshielded group (δC > 45 ppm) comprises C1 through C4, the junction carbons. These carbons are bonded to other carbons in more strained positions or in regions with greater electron density, resulting in higher chemical shifts. The more strained junction carbons (C1/C2 and C3/C4) of JP-10 stored larger energy (due to strain) also found by a recent study of Brotton et al using MP2/6-311G* and B3LYP-D*/def2-TZVP models . It reveals that generation of JP-10 radicals through C-H bond cleavage of JP-10 on strained carbons such as C3/C4, C5 and C1/C2 requires larger energies than other less strained sites of C6/C7, C10 and C8/C9 .