4 5 Dedicated to my family, for their unwavering love and support, and Elizabeth for being the light of my life. ABSTRACT The semiconducting properties of conjugated polymers are finding use in various optoelectronic applications, including chemical sensors and light-emitting diodes. In this thesis, we investigate aggregation in conjugated polymers and how it affects the optical properties of t...

A two-component condensation reaction between an electron-poor acetylenic ester and a phenol e ciently provides substituted aryl vinyl ethers in a one-pot reaction in the presence of dipotassium hydrogen phosphate in solvent-free conditions.

Some 2-iminothiazolidin-4-ones have been synthesized by the reaction of dialkyl acetylenedicarboxylates with thiosemicarbazones. The reaction was performed in the presence of 10 mol% of triphenylphosphine and tetrabutylammonium bromide as a phase transfer catalyst in water as a green solvent. All the synthesized compounds were characterized by their physical and spectral data.

Some 2-iminothiazolidin-4-ones have been synthesized by the reaction of dialkyl acetylenedicarboxylates with thiosemicarbazones. The reaction was performed in the presence of 10 mol% of triphenylphosphine and tetrabutylammonium bromide as a phase transfer catalyst in water as a green solvent. All the synthesized compounds were characterized by their physical and spectral data.

The reaction of stoichiometric amounts of dialkyl acetylenedicarboxylates with alkyl isocyanides and 5,5-diaryl thiohydantoins in toluene and catalytic amount of p-TSA afforded imidazo[2,1-b][1,3]thiazines in good overall yields

The NCNN group is an essential part of various heterocycles bearing high biological activities. 1,2,4-Triazines and their condensed derivatives found applications as pharmaceuticals and in agriculture. For example vardenafil ñ phosphodiesterase inhibitor, is useful in the treatment of male erectile dysfunctions (1), apazone exhibit anti-inflammatory and analgesic actions (2), lamotrigine is use...

C10H24F6N6O8SÌ, tetragonal, PA /̂n (no. 86), a = 15.646(1) Â, c = 8.2024(5) Â, V = 2007.9 Â, Ζ = 4, Rgl(F) = 0.052, wRrefiF) = 0.117, T= 233 K. Source of material The racemic title compound was unexpectedly obtained from a mixture of 2-azido-l,3-dimethoxyimidazolium hexafluorophosphate [1], dimethyl acetylenedicarboxylate and copper wire in methanol. Suitable crystals were harvested after allowi...

Thermally induced [4+2] cycloaddition reactions of 5-ethanesulfonyl2-methylpyridazin-3(2H)-one (2) with pyrano[3,4-b]indol-3(9H)-ones (1, 4) affords isomeric pyridazino[4,5-b]carbazolones (3a,b, 5a,b), the product ratio depending on the substitution pattern of the diene. Two carbazolocarbazoles (6, 7) were obtained as side products. The antineoplastic activity of ellipticine (5,11-dimethyl-6H-p...