Elongation of the molecular probe DDNP with phenylethynylidene or phenyldiazenylidene spacers
Tetrahedron Letters（2014）
Abstract
•The syntheses and optical properties of two elongated DDNP analogs are described.•Bromination and subsequent debromination can be a viable protective procedure.•Solid-state structures of extended DDNP analogs were determined.•Phenylethynylidene moiety affects the size but not the optical properties.
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Key words
Molecular probes,Sonogashira coupling,Knoevenagel reaction,Diazo coupling,Optical properties
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