Gas-phase stereoinversion in proteinogenic amino acid isoleucine: its astrophysical importance

Rani, Namrata; Vikas, .

doi:10.1007/s10509-021-03940-8

Cited by 2 publications

(1 citation statement)

References 36 publications

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“…Tunneling is often invoked as the mechanism behind hydrogenation reactions in the interstellar medium (ISM), both via an external incoming H atom (Meisner et al 2017;Oba et al 2018;Álvarez-Barcia et al 2018;Miksch et al 2021) playing also a role in intramolecular hydrogen/proton migrations reactions (Rani & Vikas 2020a,b, 2021García de la Concepción et al 2021). An important trait of the reactions at the cold temperatures of the ISM (and specifically in this case of H atoms) on dust grains is that they yield kinetically controlled reaction products, meaning that lower reaction barriers are correlated with molecular abundances.…”

Section: Introductionmentioning

confidence: 99%

Diastereoselective Formation of trans-HC(O)SH Through Hydrogenation of OCS on Interstellar Dust Grains

Molpeceres,

de la Concepción,

Serra

2021

Preprint

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With the presence of evermore complex S-bearing molecules being detected lately, studies on their chemical formation routes need to keep up the pace to rationalize observations, suggest new candidates for detection, and provide input for chemical evolution models. In this paper, we theoretically characterize the hydrogenation channels of OCS on top of amorphous solid water as an interstellar dust grain analog in molecular clouds. Our results show that the significant reaction outcome is trans−HC(O)SH, a recently detected prebiotic molecule toward G+0.693. The reaction is diastereoselective, explaining the seemingly absence of the cis isomer in the astronomical observations. We found that the reaction proceeds through a highly localized radical intermediate (cis−OCSH), which could be essential in the formation of other sulfur-bearing complex organic molecules due to its slow isomerization dynamics on top of amorphous solid water.

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Section: Introductionmentioning

confidence: 99%

Diastereoselective Formation of trans-HC(O)SH Through Hydrogenation of OCS on Interstellar Dust Grains

Molpeceres,

de la Concepción,

Serra

2021

Preprint

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show abstract

Diastereoselective Formation of Trans-HC(O)SH through Hydrogenation of OCS on Interstellar Dust Grains

Molpeceres

Concepción²,

Serra³

2021

ApJ

View full text Add to dashboard Cite

With the presence of evermore complex S-bearing molecules being detected lately, studies of their chemical formation routes need to keep up the pace to rationalize observations, suggest new candidates for detection, and provide input for chemical evolution models. In this paper, we theoretically characterize the hydrogenation channels of OCS on top of amorphous solid water (ASW) as an interstellar dust grain analog in molecular clouds. Our results show that the significant reaction outcome is trans-HC(O)SH, a recently detected prebiotic molecule toward G+0.693. The reaction is diastereoselective, explaining the apparent absence of the cis isomer in astronomical observations. We found that the reaction proceeds through a highly localized radical intermediate (cis-OCSH), which could be essential in the formation of other sulfur-bearing complex organic molecules due to its slow isomerization dynamics on top of ASW.

show abstract

Gas-phase stereoinversion in proteinogenic amino acid isoleucine: its astrophysical importance

Cited by 2 publications

References 36 publications

Diastereoselective Formation of trans-HC(O)SH Through Hydrogenation of OCS on Interstellar Dust Grains

Diastereoselective Formation of trans-HC(O)SH Through Hydrogenation of OCS on Interstellar Dust Grains

Diastereoselective Formation of Trans-HC(O)SH through Hydrogenation of OCS on Interstellar Dust Grains

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