作者:Karin Reinholdt、Paul Margaretha
DOI:10.1002/hlca.19830660819
日期:1983.12.14
Irradiation of the α-fluoroketones 1a and 6a in i-PrOH selectively affords the parent ketone 1b and 6b, respectively. It is concluded that in this solvent heterolytic C-F bond cleavage of the anion radical-formed by electron transfer to the excited fluoroketone-is a faster process than the subsequent protonation by the cation radical of the solvent. In cyclohexane 1b and 6b are only formed in minor
在i-PrOH中照射α-氟代酮1a和6a分别选择性地得到母体酮1b和6b。可以得出结论,在这种溶剂中,通过电子转移到激发的氟酮上而形成的阴离子基团的异质CF键裂解比通过溶剂的阳离子基团随后的质子化更快。在环己烷中仅形成了少量的1b和6b,氟化的RH还原产物4现在是1a的主要产物。在非还原性溶剂中,例如叔-BuOH或苯2-氟环己酮(1a)在激发时表现出与环己酮(1b)类似的行为。两种化合物的α裂解量子产率都相似,但是用1a的1a比用1b的2甲基丙烯作为烯烃组分的氧杂环丁烷形成要容易得多。