کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
176658 | 458952 | 2013 | 7 صفحه PDF | دانلود رایگان |
A mild and efficient protocol for the synthesis of 7,8-dihydro-10-aryl-5H-indeno[1,2-b]quinoline-9,11-diones via a one-pot four component condensation of aromatic aldehydes, dimedone, 1,3-indandione and ammonium acetate using melamine trisulfonic acid as a catalyst in ethanol is described. The catalyst could be recycled and reused three times without significant loss of activity. Dihydro-5H-indeno[1,2-b]quinolines with stabilized zwitterionic resonance structures showed feasible application as new pH indicators. These chemosensors have a large wavelength shift (100 nm) and showed excellent sensitivity in the range of pH from 9.2 to 12.
Figure optionsDownload as PowerPoint slideHighlights
► Synthesis of a new series of indenoquinoline derivatives.
► Introduction of new pH indicators in the range 9.2–12.0.
► Simple experimental procedure with no side reactions.
► High yields of the products and use of inexpensive catalyst with lower loading.
► Reusability of the catalyst.
Journal: Dyes and Pigments - Volume 97, Issue 1, April 2013, Pages 19–25