一种趋向于合成新型1,2,4-三唑树枝状大分子的合成策略,其中使用3,5-二氯-4-(4-甲氧基苯基)-4 H -1,2,4-三唑作为杂环结构单元成功探索。在这种新颖的AB 2-单体处的亲核芳香取代被用作杂环树枝状分子繁殖的关键步骤,并且这些树枝状分子同时附着在1,3,5-三嗪和亚甲基核上。外围的1,2,4-三唑不仅可以通过亲核芳族取代而且可以通过铃木交叉偶联来改变。提出的树枝状聚合物是有前途的候选物,可用于可利用大量杂原子或需要对所施加条件有更好抵抗力的应用中。
Substituent and solvent effects on the Diels–Alder reactions of triazolinediones
作者:Martin E. Burrage、Richard C. Cookson、Surash S. Gupte、Ian D. R. Stevens
DOI:10.1039/p29750001325
日期:——
The kinetics and activation parameters for the series of 4-substituted (R) 1,2,4-triazoline-3,5-diones (R = Me, Et, But, CH2Ph, Ph, p-MeOC6H4, p-NO2C6H4, or N:CHPh) have been measured for the Diels–Alder reactions with diphenylbutadiene, anthracene, hexachlorocyclopentadiene, and bicyclo[2.2.1]heptadiene. The reactions have been studied in benzene, dioxan, and ethyl acetate. The results are more in
一系列4-取代的(R)1,2,4-三唑啉-3,5-二酮(R = Me,Et,Bu t,CH 2 Ph,Ph,p -MeOC 6 H 4的动力学和活化参数,p -NO 2 C 6 H 4或N:CHPh)已与二苯基丁二烯,蒽,六氯环戊二烯和双环[2.2.1]庚二烯进行了Diels-Alder反应。已经在苯,二恶烷和乙酸乙酯中研究了反应。结果更符合Diels-Alder反应的前沿反应性轨道模型,而不是标准的线性自由能方法。
Structural study of ethyl 3-arylcarbamoyl-2,3-diazabicyclo[2.2.1]hept-5-ene-2-carboxylates: conformation and transmission of substituent effects across the diazabicycloheptene ring
grown for five compounds and their X-ray data were obtained. The electronic structure and the conformations were calculated by the semi-empirical AM1 method. Using correlations between the spectral, empirical and theoretical structural data, the transmission of substituent effects and the preferential conformation connected with the consecutive double nitrogen inversion and regarding the mutual orientation