- Establishment of heterolytic and homolytic Y-NO2 bond dissociation energy scales of nitro-containing compounds in acetonitrile: Chemical origin of NO2 release and capture
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(Chemical Equation Presented) The first heterolytic and homolytic N(O)-NO2 bond dissociation energy scales of three types Y-nitro (Y = N, O) compounds and corresponding radical anions in acetonitrile were established by using titration calorimetry combined with relevant electrochemical data through proper thermodynamic cycles.
- Li, Xin,Zhu, Xiao-Qing,Zhang, Fan,Wang, Xiao-Xiao,Cheng, Jin-Pei
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p. 2428 - 2431
(2008/09/20)
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- Enantioselective epoxidation of linolenic acid catalysed by cytochrome P450BM3 from Bacillus megaterium
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Cytochrome P450BM3, from Bacillus megaterium, catalyses the epoxidation of linolenic acid 1 yielding 15,16-epoxyoctadeca-9,12-dienoic acid 2 with complete regioand moderate enantio-selectivity (60% ee). The absolute configuration of the product is tentatively assigned as 15(R),16(S)-. The Michaelis-Menten parameters kcat and Km for the reaction were determined to be 3126 ± 226 min-1 and 24 ± 6 μM respectively. The Royal Society of Chemistry 2005.
- Celik, Ayhan,Sperandio, Davide,Speight, Robert E.,Turner, Nicholas J.
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p. 2688 - 2690
(2007/10/03)
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- Reaction of N-Nitroso- and N-Nitro-N-alkylamides with Amines
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Several N-nitroso- and N-nitrocarboxamides have been characterized by 1H and 13C NMR spectroscopy.These compounds react with ammonia and aliphatic amines to afford mainly carboxamides of general formula RCONH2, RCONHR', or RCONR'R''.N-Nitrosocarboxamides and aromatic amines give poor yields of RCONHAr; by contrast, N-nitrocarboxamides and aromatic amines lead to RCONHAr in good yields.The higher thermal stability of the N-nitroamides as compared to N-nitrosoamides is advantageous in this connection; nevertheless, the principal advantage of the NNO2 group appears to be that it activates the nucleophilic attack to the carbonyl of the amide function more than the NNO group, as has been demonstrated by competitive experiments.The reaction of N-nitroso- and N-nitro-N-methylsulfonamides with ammonia and diethylamine has been studied as well; whereas N-methyl-N-nitro-p-toluenesulfonamide reacts as N-nitrocarboxamides, transnitration is predominant with N-methyl-N-nitroso-p-toluenesulfonamide.
- Garcia, Jordi,Gonzalez, Javier,Segura, Ramon,Urpi, Felix,Vilarrasa, Jaume
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p. 3322 - 3327
(2007/10/02)
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