Authors: M. Nakashima, E. Hayon The flash photolysis of air-free aqueous acetone solutions was shown to produce CH2COCH3 and (CHg^COH radicals. The acetonyl CH2COCH3 radical has an absorption maximum at 295 nm and an extinction coef- ficient 6295 = 800 ± 150 M-1 cm-1. No intermediates could be observed in the flash photolysis of air-free aqueous amide solutions. In presence…
Authors: M. Ferus, P. Kubelík, A. Knízek, A. Pastorek, J. Sutherland, S. Civiš Recent results in prebiotic chemistry implicate hydrogen cyanide (HCN) as the source of carbon and nitrogen for the synthesis of nucleotide, amino acid and lipid building blocks. HCN can be produced during impact events by reprocessing of carbonaceous and nitrogenous materials from both the impactor and the…
Authors: E. Hayon, T. Ibata, N. N. Lichtin, M. Simic The reactivity and sites of attack of hydroxyl radicals on simple amides in aqueous solution were studied. The following amides were examined: formamide (F), N-methylformamide (NMF), N,N-dimethylformamide (DMF), acetamide (A), N-methylacetamide (NMA), and , -dimethylacetamide (DMA). The rate constants for reaction of OH radical with NMF, DMF, NMA, and DMA…
Authors: N. Hayashi, E. Hayon, T. Ibata, N. N. Lichtin, A. Matsumoto The pulse radiolysis of the following liquid amides has been investigated: formamide (F), N-methylformamide (NMF), Ar,Ar-dimethylformamide (DMF), AqAr-dimethylacetamide (DMA), and Ar-methylpropionamide (NMP). Radiation-induced ionization and excitation processes have been observed on irradiation of solu- tions of anthracene (A) and naphthalene (N), as indicated by the characteristic spectra of…