A microwave-assisted preparation of symmetrical thiazolo[5,4-d]thiazoles from the corresponding aldehydes is presented. The two-step reaction sequence comprises the condensation of aldehydes with dithiooxamide followed by oxidation/aromatization with 1,4-benzoquinone derivatives. The new procedure provides the desired products in good yields and in most cases allows reduction of the excess of aldehyde
介绍了一种微波辅助从相应的醛类制备对称的噻唑并[5,4- d ]噻唑的方法。两步反应序列包括醛与二硫代草酰胺的缩合,然后用1,4-苯醌衍生物的氧化/芳构化。与以前的方法相比,新方法以高收率提供了所需的产品,并且在大多数情况下,可以减少工艺中使用的过量醛。首次展示了该反应在芳族和脂族醛上的应用。
An unusual thiazolo[5,4-d]thiazole sensitizer for dye-sensitized solar cells
作者:Lorenzo Zani、Gianna Reginato、Alessandro Mordini、Massimo Calamante、Maurizio Peruzzini、Maurizio Taddei、Adalgisa Sinicropi、Maria Laura Parisi、Fabrizia Fabrizi de Biani、Riccardo Basosi、Alessandro Cavallaro、Mara Bruzzi
DOI:10.1016/j.tetlet.2013.05.059
日期:2013.7
A novel unsymmetrical thiazolo[5,4-d]thiazole, TZ1, endowed with an unusual pi-D-A structure featuring a highly conjugated light-harvesting backbone, has been synthesized and characterized from the photo- and electrochemical point of view. Although its structure did not resemble that of typical organic sensitizers, the new compound showed properties compatible with its employment in dye-sensitized solar cells. The experimental findings were supported by the results of DFT calculations. Indeed, when tested as a sensitizer in dye-sensitized solar cells, compound TZ1 gave rise to a high average open-circuit voltage (V-oc) of 0.712 V and an average short-circuit current (J(sc)) of 7.0 mA cm(-2), resulting in a power conversion efficiency (eta) of 2.55%. (C) 2013 Elsevier Ltd. All rights reserved.