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The reaction of alkyl hydropersulfides (RSSH, R = CH3 and tBu) with H2S in the gas phase and in aqueous solution.

A new interesting article has been published in Phys Chem Chem Phys. 2018 Oct 11. doi: 10.1039/c8cp05503c. and titled:

The reaction of alkyl hydropersulfides (RSSH, R = CH3 and tBu) with H2S in the gas phase and in aqueous solution.

Authors of this article are:

Zhang L, Zhang X, Wu YD, Xie Y, Fukuto JM, Schaefer HF.

A summary of the article is shown below:

The RSSH + H2S → RSH + HSSH reaction has been suggested by numerous labs to be important in H2S-mediated biological processes. Seven different mechanisms for this reaction (R = CH3, as a model) have been studied using the DFT methods (M06-2X and ωB97X-D) with the Dunning aug-cc-pV(T+d)Z basis sets. The reaction of CH3SSH with gas phase H2S has a very high energy barrier (>45 kcal mol-1), consistent with the available experimental observations. A series of substitution reactions R1-S-S-H + -S-R2 (R1 = Me, tBu, Ad, R2 = H, S-Me, S-tBu, S-Ad) have been studied. The regioselectivity is largely affected by the steric bulkiness of R1, but is much less sensitive to R2. Thus, when R1 is Me, all -S-R2 favorably attack the internal S atom, leading to R1-S-S-R2. While for R1 = tBu, Ad, all -S-R2 significantly prefer to attack the external S atom to form -S-S-R2. These results are in good agreement with the experimental observations.

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