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. Author manuscript; available in PMC: 2011 Sep 15.
Published in final edited form as: Free Radic Biol Med. 2010 May 21;49(6):919–962. doi: 10.1016/j.freeradbiomed.2010.05.009

Fig. 9.

Fig. 9

There is a linear relationship of pKa1 of H2Q with pKa of the corresponding SQH•. (a) 1,4-Benzoquinone; (b) methyl-1,4-benzoquinone; (c) 2,3-dimethyl-1,4-benzoquinone; (d) 2,5-dimethyl-1,4-benzoquinone; (e) 2,6-dimethyl-1,4-benzoquinone; (f) 2,3,5-trimethyl-1,4-benzoquinone; (g) duroquinone.