In this work, the p values of 69 polar alkanes (YH) in acetonitrile were computed using the method developed by Luo and Zhang in 2020, and representative 69 thermodynamic network cards on 22 elementary steps of YH and related polar alkenes (Y) releasing or accepting H were naturally established. Potential electron reductants (YH), hydride reductants (YH), antioxidants (YH and YH), and hydrogen molecule reductants (YH) are unexpectedly discovered according to thermodynamic network cards. It is also found that there are great differences between YH and common hydrogen molecule reductants (XH), such as Hantzsch ester (HEH), benzothiazoline (BTH), and dihydro-phenanthridine (PH), releasing two hydrogen ions to unsaturated compounds. During the hydrogenation process, XH release hydrides first, then the oxidation state XH release protons. However, in the case of YH, YH release protons first, then YH release hydrides. It is the differences on acidic properties of YH and XH that result in the behavioral and thermodynamic differences on YH and XH releasing two hydrogen ions (H-H). The redox mechanisms and behaviors of Y, YH, and YH as electron, hydrogen atom, hydride, and hydrogen molecule donors or acceptors in the chemical reaction are reasonably investigated and discussed in this paper using thermodynamics.
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