The quasi-homo-anomeric interaction in substituted tetrahydropyranyl radicals: Structure and kinetics of formation
作者:Athelstan L.J Beckwith、Peter J Duggan
DOI:10.1016/s0040-4020(98)00178-1
日期:1998.4
-2-yl radicals (8 and 9) indicate that these species preferentially adopt conformations in which the orientation of the ester group allows maximum overlap between the SOMO, the lone pair on the ring oxygen, and the σ∗ orbital of the CO bond. These observations support earlier proposals that the same type of stabilising interaction affects the conformations of more complex glycosyl radicals. The rates
3-酰氧基四氢吡喃-2-基(8和9)的EPR光谱表明,这些物种优先采用这样的构型,其中酯基的方向允许SOMO,环氧上的孤对和σ之间有最大的重叠* CO键的轨道。这些观察结果支持了较早的提议,即相同类型的稳定相互作用会影响更复杂的糖基自由基的构象。由相应的芳基硫化物形成7和8的速率受这种“准均一异头”相互作用的影响。