Kiran Puthamane

Chemoselective synthesis of novel thiatriazolophanes

Bis-[4-alkyl/aryl-5-thia-1,2,4-triazoles] were prepared by fusion of diacids and thiosemicarbazides by condensation of aromatic acid hydrazides with isothiocyanate. Chemoselective alkylation of these bis-[4-alkyl/aryl-5-thia-1,2,4-triazoles] with 1,w-dihaloalkanes in presence of potassium hydroxide in aqueous methanol afforded novel N-alkyl/aryl thiatriazolophanes.

Pyrophthalones as Blue Wavelength Absorbers in Thermoplastic Media

We have explored the utility of pyrophthalones as violet‐blue light filtering dyes in polymer matrices for wavelengths below 450 nm. Further, we have investigated the photodegradation of these molecules in thermoplastic media and the mechanisms behind their degradation. Finally, a range of additives have been explored to improve the photostability of these molecules to achieve the desired performance.