# Synthesis and optical properties of bis- and tris-alkynyl-2-trifluoromethylquinolines

## TL;DR

This paper reports the synthesis of alkynylated quinolines and their optical properties, showing how substitution patterns affect their behavior.

## Contribution

The novel contribution is the synthesis of bis- and tris-alkynyl-2-trifluoromethylquinolines and their optical property analysis.

## Key findings

- Bis- and tris-alkynyl-2-trifluoromethylquinolines were synthesized in good to excellent yields.
- Optical properties were studied using absorption and fluorescence spectroscopy.
- Substitution patterns and substituent types significantly influence optical behavior.

## Abstract

Three bis- or tris-brominated 2-trifluoromethylquinolines have been successfully applied in palladium-catalysed Sonogashira reactions, leading to several examples of alkynylated quinolines in good to excellent yields. Optical properties of selected products have been studied by steady state absorption and fluorescence spectroscopy which give insights of the influence of the substitution pattern and of the type of substituents on the optical properties.