Cobalt(II) sulfate heptahydrate can be used as a catalyst to synthesize:
- Benzazoles from alcohols and o-substituted anilines.
- β-Acetamido ketones via one-pot multi-component coupling reaction of aromatic aldehydes, acetophenones, and acetyl chlorides.
It can also be used as a reagent to synthesize cobalt arylphosphonate metal-organic framework.