Catalysis in aromatic nucleophilic substitution. Part 7. Kinetics of the reactions of some 5-substituted 2-methoxy-3-nitrothiophenes with piperidine in benzene
The kinetics of the reactions of some 2-methoxy-3-nitro-5-X-thiophenes (Ia–g; X = H, CONH2, CO2Me, Ac, SO2Me, CN, or NO2) with piperidine and with n-butylamine in benzene have been measured in the range 20–40 °C. The reactions with piperidine are catalysed by piperidine, being third-order overall (second-order in amine). The electronic effects of the 5-substituent on the ‘catalytic’ constants are shown
一些2-甲氧基-3-硝基-5-X-噻吩(Ia–g; X = H,CONH 2,CO 2 Me,Ac,SO 2 Me,CN或NO 2)与哌啶反应的动力学并在20–40°C范围内测量了苯中的正丁胺。与哌啶的反应由哌啶催化,总体为三级(胺中为二级)。显示5-取代基对“催化”常数的电子效应与苯中碱催化的SB-GA机理最一致。
Nitrothienols and Halogenated Nitrothiophenes
作者:Charles D. Hurd、Kenneth L. Kreuz
DOI:10.1021/ja01132a004
日期:1952.6
Consiglio, Giovanni; Arnone, Caterina; Spinelli, Domenico, Journal of the Chemical Society. Perkin transactions II, 1982, p. 721 - 724