1975
DOI: 10.1007/bf00928897
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The mechanisms of amino acids synthesis by high temperature shock-waves

Abstract: The mechanisms of amino acids synthesis behind high temperature shock-waves were elucidated and distinction was made between the steps occurring in the gas phase and those occurring in solution. In the presence of water vapor, aldehydes and HCN are formed separately in regions of different temperatures along the reacting gas. The aldehydes and ammonia condense to aldimines which add HCN to form alpha-amino nitriles, all in the gas phase. The hydrolysis to amino acids takes place in solution. In the absence of … Show more

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Cited by 33 publications
(15 citation statements)
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“…Amino acid shock tube yields of Barak and Bar-Nun (1975) together with carbon and CHON mass estimates for comets were used to calculate the concentration of AIB in the K/T sea. The ratio of total amino acids to AIB in shock tube experiments and for carbonaceous chondrites was used to estimate the total amino acid concentration in the K/T sea and primordial seas after the impact of a 10 km comet.…”
Section: Discussionmentioning
confidence: 99%
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“…Amino acid shock tube yields of Barak and Bar-Nun (1975) together with carbon and CHON mass estimates for comets were used to calculate the concentration of AIB in the K/T sea. The ratio of total amino acids to AIB in shock tube experiments and for carbonaceous chondrites was used to estimate the total amino acid concentration in the K/T sea and primordial seas after the impact of a 10 km comet.…”
Section: Discussionmentioning
confidence: 99%
“…Shock tube experiments suggest that the K/T amino acids could have been synthesized from HCN and aldehydes produced in this manner. Barak and Bar-Nun (1975) performed shock tube experiments in which simple hydrocarbons, ammonia, and water vapor, were subjected to shock temperatures that exceeded 2000 K. Amino acids, including AIB were formed when HCN and aldehydes and other reactants that formed from recombination of high temperature radicals produced from the original organic compounds reacted with other radicals. Results of Barak and Bar-Nun (1975) are very useful guides to the amounts of amino acids that could have been synthesized after comet impact.…”
Section: The Initial Concentration Of Amino Acids In Aqueous Surface mentioning
confidence: 99%
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“…This synthetic reaction, known as the strecker reaction, provides one of the most efficient methods for the synthesis of D-amino nitriles, which are hydrolyzed to give amino acids [2][3][4]. These moieties are not only very versatile intermediates for the synthesis of D-amino acids [5] but also for 1,2-diamines [6], amides [7], and various nitrogen-containing heterocycles such as thiadiazoles and imidazoles [8].…”
mentioning
confidence: 99%