Do Equol's C-ring hydrogens contribute to free radical scavenging?

Abstract

© 2020, Serbian Society of Computational Mechanics. Free radical scavenging potency of physiologically active equol molecule, derived by gut microbiota from soy isoflavone daidzein, was investigated by using M06-2X/6-311++G(d, p) level of theory, accompanied with the TST and Eckart tunneling corrections for the estimation of rate constants. Phenolic hydrogens of equol are recognized as much more abstractable than C-ring hydrogens. This finding is opposite to the one very recently suggested, but in accordance with well-known facts related to the flavonoid chemistry and phenolic O-H vs C-H reactivity.