Reduction of nitro- and nitroso-compounds by tervalent phosphorus reagents. Part XI. A kinetic study of the effects of varying the reagent and the nitro-compound in the conversion of o-nitrobenzylideneamines to 2-substituted indazoles
作者:Margaret-Ann Armour、J. I. G. Cadogan、David S. B. Grace
DOI:10.1039/p29750001185
日期:——
A kinetic study of the effects of varying the phosphorus reagent and substituents in the nitro-compound in the reductive cyclisation of o-nitrobenzylideneamines to 2-substituted indazoles has been made. First-order rate constants vary from 8.2 to 52.2 × 10–5 s–1 for the triethyl phosphite-induced reduction of N-o-nitrobenzylideneanilines [o-NO2C6H4CHNC6H4Y; Y =p-MeO, p-Me, H, p-CI, p-Br, p-CO2Et, p-CN
动力学研究了在邻硝基亚苄基胺还原成2-取代的吲唑的环化反应中改变硝基化合物中磷试剂和取代基的作用。一级速率常数从8.2变化至52.2×10 -5小号-1为的亚磷酸三乙酯诱导的减少ñ - ö -nitrobenzylideneanilines [ ø -NO 2 ç 6 ħ 4 CH NC 6 H ^ 4 ÿ; Y = p -MeO,p -Me,H,p -Cl,p -Br,p -CO 2等等,p -CN。p -NO 2,或ö ] -CI和Ñ -5-氯-2- nitrobenzylideneaniline,并略有不同的5至6×10 -5小号-1为ö -nitrobenzylideneamines [ ø -NO 2 ·C 6 H ^ 4 · CH NR; R = Me中,乙基,丙基我,或卜Ñ ]。这些反应的产物是相应的2-芳基-(芳基= C 6 H 4 Y)和2-烷基-(烷基= R)-吲唑。这