Compds. exhibiting laser dye properties are described by the general formula I (R1-2 = independently selected lower alkyl; and X = aryl); the compds. may be prepd. from a reaction mixt. comprising II (W = III, -PPh3Br, or -P(:O)(OEt)2), OHC-X-COH, K2CO3, and DMF by heating under N2 at 70° for ≥16 h, quenching with H2O, extg. with CHCl3, and purifying with silica gel column chromatog. Methods of prepg. the compds. are described which entail prepg. a reaction mixt. comprising of compd. of formula (A), arom. dialdehyde of formula (B), anhyd. potassium carbonate and dry DMF. Laser and nonlinear optical dye media comprising I in a nonpolar solvent, fluorescence stds. based on I, and optical limiters and saturable absorbers using I are also described. [on SciFinder(R)]
