443890-98-0Relevant academic research and scientific papers
Dithienylethenes with a novel photochromic performance
Morimitsu, Kentaro,Shibata, Katsunori,Kobatake, Seiya,Irie, Masahiro
, p. 4574 - 4578 (2002)
Dithienylethenes with low decoloration quantum yields and thermal reversibility at high temperature above 100°C were prepared. Introduction of bulky alkoxy substituents at 2- and 2′-positions of the thiophene rings strongly suppressed the cycloreversion quantum yields. The quantum yields were lower than 10-3, and the photogenerated color remained stable enough under room light. On the other hand, the bulky alkoxy substituent decreased the thermal stability of the colored closed-ring isomers at high temperature. The color of the dithienylethene with cyclohexyloxy substituents faded out in less than 1 min at 160°C.
METHOD OF SYNTHESIS OF 5,6?BIS(5?ALKOXYTHIOPHEN?2?YL)PYRAZINE-2,3-DICARBONITRILES, DERIVATIVES OF DICYANOPYRAZINE AND USE THEREOF
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Page/Page column 7; 8, (2019/10/19)
The present invention relates to a method of synthesis of compounds of general formula (I) wherein R is linear or branched (C1-C8) alkyl, (C5-C6) cycloalkyl or benzyl, the method comprising the following steps: 10 step a) Friedel-Crafts reaction of thioph
