**Acknowledgements**

I thank Professors Peter Lipke and Carol Moore for their insights and direction that led me to investigate Fenton chemistry and write Ovalle et al. (2001) and (2020), and Professor Clifford E Soll, who invested hundreds of hours devising the gradient and conditions for sharp separations of the TBT-labeled carbohydrate fragments, but did not live to see the fruition of our collaboration.

Special thanks to Mr. Lijie Chen who acted as my secretary, sounding board, and webmaster as I wrote Ovalle et al. (2020), helping me unearth 100+ years of Fenton literature including the personal histories of the many scientists that followed the path discovered by Prof. Fenton.

I also thank Professors Claude Brathwaite and Barbara Studamire for financial and moral support during the long writing of Ovalle et al. (2020). Finally, I thank Professors Rick Magliozzo, Richard Burger, and Alex Greer for insights into iron-oxygen interactions.

The works of Ovalle et al. (2001) and Ovalle et al. (2020) were supported by NIH GM47176 and RCMI RR03037 grants.
