Effect of side-chain length in lignin model compound on MnO2 oxidation: comparison of oxidations between C6-C2- and C6-C1-type compounds

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 1 Pseudo-first-order reaction rate constants (k_obs) obtained from three duplicated runs and squared correlation coefficients (R²) of each run in the MnO₂ oxidation of compounds IV and V observed in this study and in that of compounds II and III observed in our recent report [4]

Com.^a	k_obs^b	R²	Com.^a	k_obs^b	R²	k_obs(II)/k_obs(III)
II_H	14.7 ± 0.1	0.995	III_H	3.13 ± 0.09	0.995	k_obs(II_H)/k_obs(III_H) = 4.7
		0.997			0.986
		0.995			0.987
II_G	911 ± 23	0.999	III_G	227 ± 8	1.00	k_obs(II_G)/k_obs(III_G) = 4.0
		0.985			1.00
		0.988			1.00
II_S	343 ± 18	0.962	III_S	127 ± 2	0.983	k_obs(II_S)/k_obs(III_S) = 2.7
		0.968			0.985
		0.994			0.983
II_E	2.09 ± 0.06	0.995	III_E	0.244 ± 0.008	0.961	k_obs(II_E)/k_obs(III_E) = 8.6
		0.992			0.958
		0.991			0.941

Com.^a	k_obs^b	R²	Com.^a	k_obs^b	R²	k_obs(IV)/k_obs(V)
IV_H	3.66 ± 0.01	0.942	V_H	0.867 ± 0.013	0.984	k_obs(IV_H)/k_obs(V_H) = 4.2
		0.946			0.982
		0.939			0.957
IV_G	315 ± 21	1.00	V_G	96.2 ± 0.7	0.999	k_obs(IV_G)/k_obs(V_G) = 3.3
		1.00			0.998
		1.00			0.999
IV_S	55.6 ± 2.0	0.984	V_S	28.9 ± 1.1	0.960	k_obs(IV_S)/k_obs(V_S) = 1.9
		0.978			0.980
		0.989			0.974
IV_E	0.478 ± 0.008	0.952	V_E	0.0627 ± 0.0005	0.978	k_obs(IV_E)/k_obs(V_E) = 7.6
		0.968			0.984
		0.978			0.989

^aAbbreviation of compound
^bUnit: × 10^–4 min⁻¹. The values after the ‘ ± ’ marks are standard deviations obtained from three duplicated runs