作者:Glen A. Russell、Rajive K. Khanna
DOI:10.1016/s0040-4020(01)97189-3
日期:1985.1
The SRN1 free radical chain reaction of Me3CHgCl with nitronate (−O2NC(R1)(R2)) and phenone enolate (PHC(0−)C(R1)(R2)) anions yields the C-alkylation products (Me3CC(R1)(R2)N02, PhCOC(R1)(R2)CMe3). Competitive reactions between pairs of anions demonstrate that as the basicity of the anion increases the reactivity toward Me3C at first increases and then decreases. An inverted reactivity order is also
在S RN的Me 1自由基链式反应3 CHgCl与氮酸盐(- Ö 2 NC(R 1)(R 2))和苯酮的烯醇化物(PHC(0 -)C(R 1)(R 2))阴离子产生C-烷基化产物(Me 3 CC(R 1)(R 2)NO 2,PhCOC(R 1)(R 2)CMe 3)。阴离子对之间的竞争性反应表明,随着阴离子的碱性增加,其对Me 3的反应性C首先增加,然后减少。与苯基乙腈阴离子也观察到相反的反应顺序。在早期过渡态反应中,-丁基自由基的亲核特性显然通过过渡态来控制反应性,该过渡态涉及电子从自由基转移至共振稳定阴离子的LUMO。