Biomass-to-biomass strategy: sulphonic acid functionalized covalent organic frameworks for metal-free esterification of biomass-derived acids
A sulphonic acid functionalized Covalent Organic Framework (COF–SO3H) was synthesized via an ultrasound-assisted aqueous-phase Schiff base condensation, providing a green and efficient route to incorporate Brønsted acidic sites directly into the framework. Characterisation techniques showed that the resulting material...