The synthetic methodology for tetrahydrobenzo[b]pyran by a green approach in aqueous medium catalyzed by Sodium toluene-4-sulfonic acid (STS) represents an environmentally conscious and sustainable method. The utilization of aqueous medium aligns with principles of green chemistry, aiming to minimize environmental impact and promote sustainability in chemical processes. This green synthesis may involve the use of catalysts, such as sodium toluene-4-sulfonic acid known for its water compatibility. The method not only emphasizes the importance of reducing toxic waste and by-products but also contributes to the development of more eco-friendly synthetic routes. This approach showcases the commitment to adopting practices that are both efficient and environmentally responsible in the formation of tetrahydrobenzo[b]pyran.