One-Electron Reductive Cleavage of the C–Cl Bond of ArCF<sub>2</sub>Cl: Convenient Route for the Synthesis of ArCF<sub>2</sub>Derivatives
作者:Masato Yoshida、Ayako Morishima、Daiki Suzuki、Masahiko Iyoda、Kozo Aoki、Shigeru Ikuta
DOI:10.1246/bcsj.69.2019
日期:1996.7
When ArCF2Cl was reacted with PhSeNa in DMF in the presence of light, it was found that a SRN1 type reaction occurred to give ArCF2SePh. As the reaction did not proceed without light, the substitution reaction should be initiated by photo-induced electron transfer from PhSe− to ArCF2Cl. The cleavage of the C–Cl bond of PhCF2Cl by one-electron reduction with samarium(II) iodide to give a PhCF2 radical and chloride ion was also observed. The PhCF2 radical, thus formed, was trapped by styrene and phenylacetylene before it was reduced to PhCF2 anion. UHF/3-21G calculation demonstrated that one-electron reduction in PhCF2Cl led the spontaneous dissociation of the C–Cl bond to the PhCF2 radical and Cl−, but the PhCF3 radical anion existed as a stable form.
当ArCF2Cl与PhSeNa在DMF中在光存在下反应时,发现发生SRN1型反应,生成ArCF2SePh。由于反应在没有光的情况下无法进行,因此取代反应应通过光诱导电子从 PhSe− 转移到 ArCF2Cl 来引发。还观察到用碘化钐(II)进行单电子还原,PhCF2Cl的C-Cl键断裂,产生PhCF2自由基和氯离子。由此形成的PhCF2自由基在被还原为PhCF2阴离子之前被苯乙烯和苯乙炔捕获。 UHF/3-21G计算表明,PhCF2Cl中的单电子还原导致C-Cl键自发解离为PhCF2自由基和Cl−,但PhCF3自由基阴离子以稳定形式存在。