Addition-addition-elimination mechanism of 1,3-dipole “dimerization”
作者:Helmut Dorn、Thomas Kreher
DOI:10.1016/0040-4039(88)85052-4
日期:1988.1
Proof is presented for the three step ADD-ADD-EL pathway to thermal “dimers” of pyrazolidin-3-one-azomethinimines without a centre of symmetry, pyrazolidin-3-one acting as a special type of nucleophilic catalyst.
Ring-fused hexahydro-1,2,4,5-tetrazines: synthesis, structure, and mechanistic studies on isolable rotational isomers
作者:Yasunori Toda、Airi Kooguchi、Kimiya Sukegawa、Ayaka Kikuchi、Hiroyuki Suga
DOI:10.1039/d2cc06170h
日期:——
We designed conformationally stable rotationalisomers around the C(sp2)–C(sp3) axis at the C3-position of hexahydro-1,2,4,5-tetrazines. Isolation of each rotamer by silica gel column chromatography was successfully achieved at room temperature. The proposed isomerization mechanism of the rotamers was supported by NMR kinetic studies.
我们在六氢-1,2,4,5-四嗪的 C 3位围绕 C(sp 2 )–C(sp 3 ) 轴设计了构象稳定的旋转异构体。在室温下成功地实现了通过硅胶柱层析分离每个旋转异构体。NMR 动力学研究支持所提出的旋转异构体的异构化机制。