Element Effect Revisited. Variable and Inverse Element Effect in the S<sub>N</sub>Ar Reaction of Picryl Halide and 2,4-Dimethoxyaniline
作者:Naoki Sugiyama、Jun-ichi Hayami
DOI:10.1246/cl.1999.691
日期:1999.7
made of the SNAr reaction of picryl halides (PicX, X = F, Cl) with 2,4-dimethoxyaniline in organic solvents. The element effect, kΨPicF/kΨPicCl, was found to be well-known large value at high [DMA], however, diminished continuously as the decrease of [DMA], and an inverse element effect was observed in CH3CN. Variable/inverse element effect has not been suggested for SNAr reaction and clearly shows
对苦基卤化物 (PicX, X = F, Cl) 与 2,4-二甲氧基苯胺在有机溶剂中的 SNAr 反应进行了动力学研究。发现元素效应 kΨPicF/kΨPicCl 在 [DMA] 高时是众所周知的大值,但随着 [DMA] 的减少而不断减弱,并且在 CH3CN 中观察到逆元素效应。SNAr 反应没有提出变元/逆元效应,清楚地表明在用作反应机理的探针时必须小心。