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Synthesis 2021; 53(02): 318-325
DOI: 10.1055/s-0040-1707896
DOI: 10.1055/s-0040-1707896
special topic
Functional Organic Molecules
Merocyanine Dyes with Extended Polymethine Chains by Simple Two-Step Condensation Sequence
Financial support for this project was provided by the Bundesministerium für Bildung und Forschung (BMBF) within the collaborative research program LOTsE (FKZ: 03K3503C).Further Information
Publication History
Received: 07 May 2020
Accepted after revision: 26 May 2020
Publication Date:
20 July 2020 (online)
Published as part of the Special Topic Functional Organic Molecules
Abstract
We describe a synthetic method for the synthesis of merocyanine dyes containing a bridge with three conjugated double bonds. This method consists of two successive condensation reactions. The first one is made between CH-acidic indane-1,3-dione acceptor units and an appropriate ketone (here acetone or hexan-2-one). The extended acceptor thus obtained is condensed with an aldehyde in the next step. The dyes show high tinctorial strength due to intense absorption bands at wavelengths between 500 and 750 nm.
Keywords
Knoevenagel condensation - merocyanine dyes - UV-vis absorption spectroscopy - polymethine chain elongationSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0040-1707896.
- Supporting Information
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