Table 2.

The corresponding parameters of reaction rate constant calculation for the first step of radical substitution of camptothecin under acidic conditions.^c (298.15 K).

Site	FTS1 (cm−1)	κ	QA1a	QB1b	QTS1	ΔE1 (kcal/mol)
7	−280.81	1.027	1.27 × 1010	4.47 × 1022	2.50 × 1024	5.42
9	−396.00	1.054	–	–	2.68 × 1024	8.28
10	−412.99	1.059	–	–	2.25 × 1024	9.16
11	−368.16	1.047	–	–	2.19 × 1024	8.16
12	−444.43	1.068	–	–	2.46 × 1024	6.88
14	−362.43	1.045	–	–	2.43 × 1024	7.35

^aRepresents that the protonated camptothecin molecule.

^bRepresents that the methyl radical.

^c“-” represents that the value is same as above.