Selective syntheses of vinylenedithiathiophenes (VDTTs) and dithieno[2,3-b;2′,3′-d]thiophenes (DTTs); building blocks for π-conjugated systems
作者:Ipek Osken、Onur Sahin、Ali S. Gundogan、Hakan Bildirir、Asli Capan、Erdal Ertas、Mehmet S. Eroglu、John D. Wallis、Kevser Topal、Turan Ozturk
DOI:10.1016/j.tet.2011.11.059
日期:2012.1
Selective syntheses of 3,4-vinylenedithiathiophenes (VDTTs) and dithieno[2,3-b;2′,3′-d]thiophenes (DTTs), having Ph, 4-CH3OC6H4, 4-BrC6H4, 4-NO2C6H4 and 4-(CH3)2NC6H4 groups, were achieved through the reaction of 1,8-diketone with phosphorus decasulfide (P4S10). The reaction could be shifted between VDTT and DTT by adding base (sodium bicarbonate) or acid (para-toluenesulfonic acid), respectively,
的3,4- vinylenedithiathiophenes(VDTTs)和二噻吩并[2,3-选择性合成b ; 2',3'- d ]噻吩(税收协定),具有的pH值,4-CH 3 OC 6 H ^ 4,4- BRC 6 ħ通过4,4 -NO 2 C 6 H 4和4-(CH 3)2 NC 6 H 4基团是通过1,8-二酮与十硫化磷(P 4 S 10)反应而获得的。通过添加碱(碳酸氢钠)或酸(对-甲苯磺酸)分别加入到反应混合物中。虽然VDTT的产量中等,但DTT的合成却取得了重要的成就,与以前的报道相比,DTT的产率更高。VDTT的聚合物是乙二氧基噻吩EDOT的类似物,是使用FeCl 3制备的。不幸的是,所有对其电聚合的尝试都失败了。自旋密度计算表明,在噻吩环的“α”碳原子上,没有任何VDTT具有明显的正自旋密度。考虑到它们的溶解度和官能团(可以进一步衍生),它们是制备新有机材料的有用组成部分。