双二碘二酰亚胺已还原了四个二氧杂双环[ n .2.2]烯烃(n = 1-4)。对于每一个减少,产品的从所产生的量的比率的顺式2个氘原子的-addition双键的面顺向双氧桥到从除了所产生的反面已被确定1个H-去耦2 H nmr光谱学和单个异构体的结构已通过1 H nmr光谱学确定。环戊二烯内过氧化物(n = 1)仅产生反异构体,而环己二烯内过氧化物(n= 2)得到含有66%顺式异构体的混合物,而环庚二烯和环辛二烯内过氧化物(n= 3和4)仅给出顺式异构体。结果与整个系列在电子和空间效应方面的预期变化一致。
UV laser photochemistry: triplet biradical trapping efficiencies and lifetimes
作者:Waldemar. Adam、Klaus. Hannemann、R. Marshall. Wilson
DOI:10.1021/ja00265a015
日期:1986.3
been studied quantitatively. The lifetime of 1 has been found to range between 720 and 900 ns and that of 2 between 53 and 94 ns depending on the solvent. The biradical 1 was found to be trapped in essentially quantitative yield with no indication of oxygen-catalyzed intersystem crossing. In contrast, 2 was found to be trapped in 54-79% yield with the residual biradical quenching being due to oxygen-catalyzed