An unusually fast Chapman-like thermal rearrangement in the solid state
作者:Mich�le Dessolin、Michel Golfier
DOI:10.1039/c39860000038
日期:——
Some 5-methoxy-2-aryl-1,3,4-oxadiazoles undergo a 1,3 O-to-N thermalrearrangement of the methyl group, which takes place unusually easily, and much faster in the solidstate than in the melt.
DESSOLIN, M.;GOLFIER, M., J. CHEM. SOC. CHEM. COMMUN., 1986, N 1, 38-39
作者:DESSOLIN, M.、GOLFIER, M.
DOI:——
日期:——
Metal-Free Synthesis of 1,3,4-Oxadiazoles from N′-(Arylmethyl)hydrazides or 1-(Arylmethyl)-2-(arylmethylene)hydrazines
作者:Zhenhua Shang、Sheng Tan、Qianqian Chu
DOI:10.1055/s-0034-1379974
日期:——
tert-butyl ether. Aldehyde N-acylhydrazones and aldazines were initially generated in situ as intermediates. An efficient and versatile metal-free synthesis of 1,3,4-oxadiazolesfrom N′-(arylmethyl)hydrazides or 1-(arylmethyl)-2-(arylmethylene)hydrazines through oxidative dehydrogenation is reported. A range of 2,5-disubstituted1,3,4-oxadiazoles were prepared by treating N′-(arylmethyl)hydrazides with (diacetoxyiodo)benzene
A double ionic mechanism for the Chapman-like rearrangement of imino-ethers to N-alkylmides, in the solid state or in the melt. Theoretical and experimental evidence
Using 5-methoxy-2-aryl-1,3,4-oxadiazoles as models it was shown that the thermal rearrangement of imino-ethers to N-alkylamides proceeds through a double ionic mechanism; kinetic measurements in the solid state and in the melt give apparent activation energies that support ab initio calculated activation enthalpies.
以 5-甲氧基-2-芳基-1,3,4-恶二唑为模型,研究表明亚氨基醚到 N-烷基酰胺的热重排是通过双离子机制进行的;在固态和熔体中进行的动力学测量给出了表观活化能,支持 ab initio 计算的活化焓。