1. Performance Chemicals

• Improved synthesis of 3-(1H-indol-3-yl)-1,3-diphenylpropan-1-ones: MnCl₂ has been used as a catalyst in water to facilitate the reaction between chalcones and indole, yielding 3-(1H-indol-3-yl)-1,3-diphenylpropan-1-ones. This method avoids the use of expensive, corrosive, or toxic reagents and solvents.
• Manganocene synthesis: Anhydrous MnCl₂ is a key starting material for the synthesis of manganocene, a valuable organometallic compound. 
• Precursor: MnCl₂ serves as a precursor for the synthesis of various other manganese complexes and compounds. 
• Laboratory reagent: MnCl₂ is widely used as a reagent in laboratories for various chemical syntheses and analytical chemistry applications. 
• Redox reactions: MnCl₂ can participate in redox reactions due to the variable oxidation states of manganese, making it useful in processes like chlorine gas production. 
• Magnetic materials: The paramagnetic properties of MnCl₂ are utilized in the production of magnetic materials. 
• Manganese supplement: MnCl₂ is also used as a manganese supplement in laboratory experiments and in total parenteral nutrition (TPN) therapy.

2. Agrochemicals

• Micronutrient Fertilizer: Manganese is an essential micronutrient for plant growth, and manganese chloride can be added to fertilizers to correct deficiencies in the soil.
• Stress Resistance: In some formulations, manganese chloride is combined with adjuvants to enhance a plant's resistance to various environmental stresses and promote root and seedling growth.

3. Pharmaceuticals

• Total Parenteral Nutrition (TPN): Manganese chloride is added to intravenous solutions used in TPN to provide the body with necessary manganese, especially in patients who cannot receive nutrition orally. 
• Manganese Deficiency: It's used to treat or prevent manganese deficiency, a condition where the body doesn't have enough manganese. 
• Research: Manganese chloride is used in various research settings to investigate manganese's role in biological processes, such as enzyme function, cellular uptake, and the effects on gene expression.

4. Metal Treatment

• Steel Production: Manganese chloride is a key ingredient in steel production. It acts as a deoxidizer and desulfurizer, removing impurities from the molten steel. 
• Alloying Agent: Manganese is added to steel as an alloying element, significantly improving its strength, toughness, hardness, wear resistance, and hardenability. 
• Stainless Steel: Adding about 1% manganese can turn steel into stainless steel, enhancing its corrosion resistance. 
• Manganese Steel: Alloys containing up to 15% manganese exhibit high hardness, strength, and wear resistance.