Synthesis of some Novel Oxygen-Containing Cyanine Dyes

Abstract p- Substituted 2-phenyl-4,5-dihydrofurylium hexachloroantimonates and their 5-methyl analogues underwent acid-catalysed condensation with ethyl orthoformate, malonaldehyde tetraethyl acetal, and glutaconaldehyde potassium salt to give a facile synthesis of a series of novel cyanine dyes involving oxonium salt-enol ether resonance. X-ray crystallography of bis [2- (p- fluorophenyl)-4N-dihydrofur-3-yl]methinecyanide hexachloroantimonate was studied .