In this work, I successfully synthesised four new biphenyl analogues with different electron-accepting groups: carbonyl, 1,3-dicarbonyl, malononitrile, and oxo-pyran-carbonitrile. A large difference in the wavelength of the emitted light was observed – suggesting a significant effect of electron-withdrawing groups on optical properties of molecules. The products were synthesised using a combination of Suzuki cross-coupling, Claisen, and Knoevenagel condensation reactions. The derivatives prepared in this work could be potentially used as molecular probes for the detection of tau aggregates in the blood of patients with neurodegenerative diseases.
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