Radical Nucleophilic Substitution of 2-(4-Halophenyl)-2-methyl-1-chloropropane with Enolate Ions of Ketones
作者:Adriana B. Pierini、Mariana H. Gallego、Karina F. Crespo Andrada
DOI:10.1021/jo062457i
日期:2007.4.1
The photoinitiated reaction of 2-(4-halophenyl)-2-methyl-1-chloropropane 2a,b (halogen = Br, I, respectively) with the anions of pinacolone (3a) and acetophenone (3b) either in DMSO or in liquid ammonia are reported. In DMSO, the main reaction is the SRN1 nucleophilic substitution at the aromatic (Csp2-halogen) center with substitution or reduction at the aliphatic (Csp3-Cl) one. In liquid ammonia
2-(4-卤代苯基)-2-甲基-1-氯丙烷2a,b(分别为卤素= Br,I)与吡那酮(3a)和苯乙酮(3b)的阴离子在DMSO或液体中的光引发反应有氨气报道。在DMSO中,主要反应是在芳族(C sp2-卤素)中心的S RN 1亲核取代与在脂族(C sp3- Cl)的取代或还原。在液氨中,主要反应是在芳族C卤素位点进行取代。产物分布的这种差异归因于C sp3速率常数的变化提议的自由基阴离子的-Cl解离是从DMSO(rt)到液态NH 3(-33°C)的中间体。