| PCDTs | polychlorinated dibenzothiophenes |
| PCTAs | polychlorinated thianthrenes |
| PCDDs | polychlorinated dibenzo-p-dioxins |
| PCDFs | polychlorinated dibenzofurans |
| R1 | 2,4-dichlorothiophenoxy radical |
| R2 | 2-sulfydryl-3,5-dichlorophenyl radical |
| DR | 3,5-dichlorothiophenoxyl diradical |
| 1,3,8-TCTA | 1,3,8-trichlorothianthrene |
| 1,3,6,8-TeCTA | 1,3,6,8-tetrachlorothianthrene |
| 1,3,7,9-TeCTA | 1,3,7,9-tetrachlorothianthrene |
| 1,3,7-TCTA | 1,3,7-trichlorothianthrene |
| 2,4,7,9-TeCTA | 2,4,7,9-tetrachlorothianthrene |
| 2,4,6,8-TeCDT | 2,4,6,8-tetrachlorodibenzothiophene |
| 2,6,8-TeCDT | 2,6,8-trichlorodibenzothiophene |
| DFT | density functional theory |
| TST | transition state theory |
| IRC | intrinsic reaction coordinate |
| ZPE | zero-point energy |
| MEPs | minimum energy paths |
| CVT | canonical variational transition-state theory |
| SCT | small curvature tunneling |