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- W1989656002 abstract "Treatment of N-alkoxy-N-chloro- or N-acetoxyamides with sodium azide in aqueous acetonitrile results in SN2 displacement of chlorine or acetate and the formation of reactive N-alkoxy-N-azidoamides which undergo a concerted decomposition to esters and nitrogen. The properties of the model N-azido-N-methoxyformamide have been computed at the B3LYP/6-31G* hybrid density functional level of theory. It is a typical anomeric amide in that the nitrogen is strongly sp3 hybridised resulting in a low amide isomerisation barrier. It decomposes in a two-step process involving exothermic loss of N2 to give 1-formyl-1-methoxydiazene which spontaneously undergoes a HERON decomposition to methyl formate and N2. Overall, the process is highly exothermic (ΔG between −654 and −659 kJ mol−1). The competitive one-step HERON process involving formation of methyl formate and tetrazene is kinetically unfavourable. Sterically hindered ester formation will be facilitated by both exothermicity and a transition state for ester formation which avoids a sterically crowded tetrahedral intermediate." @default.
- W1989656002 created "2016-06-24" @default.
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- W1989656002 date "2002-08-30" @default.
- W1989656002 modified "2023-09-23" @default.
- W1989656002 title "A computational investigation of the structure of the novel anomeric amide N-azido-N-methoxyformamide and its concerted decomposition to methyl formate and nitrogen" @default.
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- W1989656002 doi "https://doi.org/10.1039/b204232k" @default.
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