Study of Heterogeneous Catalysis by Iron-Squarate based 3D Metal Organic Framework for the Transformation of Tetrazines to Oxadiazole derivatives
摘要:
We present here a simple, milder, and environmentally benign heterogeneous catalytic method for the transformation of tetrazines to oxadiazole derivatives at room temperature (25 degrees C) using our earlier synthesized iron-squarate based 3D metal organic framework, [Fe-3(OH)(3)(C4O4)(C4O4)(0.5)](n) (FeSq-MOF).
1,2,4,5-Tetrazines 1 readily react with cyclopropenes 2 to form 3,4-diazanorcaradienes 3, 4, 7 and 8 in a cycloaddition − cycloelimination sequence. Compounds 3 and 4 still act as 1,3-dienes with cyclopropenes 2, producing aliphatic azocompounds 5 and 6, versatile starting compounds in thermolysis and photolysis reactions.
sequence to give 3,4-diazanorcaradienes 9 with endo configuration of the methyl group at C-7. On gentle heating in inert solvents, these 3,4-diazanorcaradienes 9 are cleanly transformed into semibullvalenes 11. This reaction sequence can also be performed as a one-pot method. Kinetic investigations and comparisons with two model systems are in agreement with the proposed reaction mechanism.
Novel synthesis of 3,6-disubstituted-1,2,4,5-tetrazine derivatives from hydrazones by using [hydroxyl(tosyloxy)iodo]benzene
作者:Haixuan Liu、Yunyang Wei
DOI:10.1016/j.tetlet.2013.06.053
日期:2013.8
A mild and efficient protocol for the construction of 1,4-dihydro-3,6-disubstituted-1,4-bis(p-toluenesulfonyl)-1,2,4,5-tetrazines from p-toluenesulfonyl hydrazones mediated by [hydroxyl(tosyloxy)iodo]benzene in the presence of pyridine has been developed. This protocol affords the products in good to excellent yields. The corresponding 3,6-disubstituted-1,2,4,5-tetrazines can be easily obtained through
Synthesis of Stable Derivatives of C<sub>62</sub>: The First Nonclassical Fullerene Incorporating a Four-Membered Ring
作者:Wenyuan Qian、Shih-Ching Chuang、Roberto B. Amador、Thibaut Jarrosson、Michael Sander、Susan Pieniazek、Saeed I. Khan、Yves Rubin
DOI:10.1021/ja029679s
日期:2003.2.1
A rational synthetic approach to the first four-membered ring-containing derivatives of C(62) is reported. They were synthesized by an inverse electron demand Diels-Alderreaction of 3,6-diaryl-1,2,4,5-tetrazines with C(60) in o-dichlorobenzene, followed by visible light irradiation at reflux. The structure of these nonclassical fullerenes derivatives was determined by X-ray single-crystal diffraction
报告了第一个四元环含衍生物的 C(62) 的合理合成方法。它们是通过 3,6-二芳基-1,2,4,5-四嗪与 C(60) 在邻二氯苯中的逆电子需求 Diels-Alder 反应合成的,然后在回流下进行可见光照射。这些非经典富勒烯衍生物的结构由 X 射线单晶衍射确定。