Seven novel pentamethine cyanine dyes with 3, 5‐dimethylpyridinium‐1‐yl, pyridinium‐1‐yl,
and 1‐quinolinum‐1‐yl substituents in the γ position of the methine chain containing ester or …

Three novel pentamethine cyanine dyes with 3, 5-dimethylpyridinium-1-yl and 4-
benzylpyridinium-1-yl substituents in γ position of the methine chain were synthesized via a …

2-Cyanomethylene (2-ethoxy carbonylmethylene)-4, 5-dihydrothiazolin-4-one 1a, b and 2-
cyanomethylene (2-ethoxy carbonylmethylene)-4, 5-dihydrothiazolo [3, 2-a] oxazole 3a, b …

Abstract New unsymmetrical 2 [2 (4)]‐mono‐and tri (substituted tri)‐methine cyanine dyes
incorporating 1, 2, 5, 6‐tetrahydro‐4, 6‐diaryl pyrimidine (pyrimidinium‐1‐yl salt)‐2‐one …

The reaction of a ratio of 1 mol of 2-chloro-1-formyl crotonic ester 1 with 2 mol of an
appropriate 2 (4)-heterocyclic quaternary salt afforded the novel pentamehine cyanine dyes …

The reaction of a ratio of 1 mole of 5‐chloro‐3‐methyl‐1‐phenyl pyrazolo‐4 [2 (4)]‐
dimethine cyanine (1a, b) or (5‐chloro‐4‐formyl‐3‐methyl‐1‐phenylpyrazole) 2 with 2 …

A series of meso-chlorine substituted heptamethine-cyanine dyes and related heptamethine
cyanine dyes unsubstituted on the vinyl chain were synthesized by condensation of 2, 3, 3 …

In this paper, the synthesis and spectral properties of novel asymmetrical and symmetrical
monomethine cyanine dyes are described. Reaction of phenylpyrazolones and oxazolones …

A series of novel monomethine cyanine dyes were synthesized by using 3-methyl-5-
substituted-1-phenyl-pyrano [2, 3-c] pyrazole derivatives 2a–c. Reaction of equimolar ratios …

Novel monomethine, dimethine, trimethine, styryl and aza-styryl cyanine dyes having
naphthfuro [3, 2-d] pyrazole nucleus were prepared. The visible spectral behaviour of the …