Photolysis and Oxidation of Azidophenyl-Substituted Radicals: Delocalization in Heteroatom-Based Radicals
作者:Paul R. Serwinski、Burak Esat、Paul M. Lahti、Yi Liao、Richard Walton、Jiang Lan
DOI:10.1021/jo049500r
日期:2004.8.1
|D/hc| = 0.336 cm-1, |E/hc| = 0.004 cm-1 (11 from 25). UB3LYP/6-31G* computations and ESR spectroscopic analyses suggest that these are nitreno radicals, even para-linked systems with possible quinonoidal resonance forms. Neat samples of azidophenyl radicals 14 and 21 showed bulk paramagnetic behavior, consistent with the lack of close contacts in their crystal structures. Efforts to make photolabile
2-(4-叠氮苯基)-4,4,5,5-四甲基-4,5-二氢-1 H-咪唑-3-氧化物-1-氧基(14),2-(4-叠氮苯基)苯并咪唑-1 -氧化物-3-氧基(16),2-(4-叠氮基苯基)-1,2,6-三苯基枯基(19),2-(3-叠氮基苯基)-4,4,5,5-四甲基-4,5二氢1H -咪唑-3-氧化物-1-氧基(21),和(3-叠氮基苯基) - ñ -叔丁基- ñ -aminoxyl(25)中的冷冻溶液中光解,得到小号= 3/2状态具有以下零场分裂参数的相应亚硝基苯基自由基的ESR谱:| D / hc | =0.277厘米- 1,| E / hc | ≤0.002厘米- 1(7从14); | D / hc | = 0.256 cm - 1,| E / hc | | ≤0.002厘米- 1(8从16); | D / hc | = 0.288 cm - 1,| E / hc | | ≤0.002厘米-