作者:Mariella Mella、Mauro Freccero、Angelo Albini
DOI:10.1039/c39950000041
日期:——
Thermochemical cycles show that deprotonation of alkane radical cations is an exothermic process, and indeed photoinduced SET between several alkanes and 1,2,4,5-tetracyanobenzene (TCB) is followed by efficient deprotonation of the radical cation with tertiary > secondary > primary selectivity; the alkyl radical is trapped by TCB˙– or, when present, by oxygen; when tetrachloro-p-benzoquinone is used in the place of TCB, the radical is further oxidized to the cation.
热化学循环显示,烷烃自由基阳离子的去质子化是一个放热过程,事实上,多种烷烃与1,2,4,5-四氰基苯(TCB)之间的光诱导单电子转移(SET)之后,随之发生高效的自由基阳离子去质子化,具有三级 > 二级 > 初级的选择性;烷基自由基被TCB˙–捕获,或在存在时被氧气捕获;当四氯对苯醌替代TCB使用时,自由基进一步被氧化为阳离子。