o-Quinonoid Heterocycles: Synthesis and Crystal Structure of 2,3-Dicyano-5,7-bismethylthieno[3,4-b]pyrazine
作者:Eva Mørkved、Jon Beukes、Frode Mo
DOI:10.3390/12081623
日期:——
2,3-Dicyano-5,7-bismethylthieno[3,4-b]pyrazine (5), has been obtained as a minor product from reactions of S-nucleophiles with 5,6-di(1-bromoethyl)pyrazine-2,3-dicarbonitrile (3), or from a condensation of 4-hydroxy-2,5-dimethyl-2,3-dihydrothiophen-3-one (4) with diaminomaleonitrile. The molecular structure of compound 5 has been confirmed by X-ray diffraction. A partial separation of charge causes
2,3-Dicyano-5,7-bismethylthieno[3,4-b]pyrazine (5),是 S-亲核试剂与 5,6-di(1-bromoethyl)pyrazine-2 反应的次要产物,3-二甲腈 (3),或来自 4-羟基-2,5-二甲基-2,3-二氢噻吩-3-酮 (4) 与二氨基马来腈的缩合。X射线衍射证实了化合物5的分子结构。电荷的部分分离导致平面分子在均匀平行堆叠中的施主-受主型排列,在 100 K 时的面间距为 3.334(2) A。