K. B. Shiva Kumar

Zinc Hydroxyapatite–Catalyzed Efficient Synthesis of 5‐Substituted 1H‐Tetrazoles

Abstract Zinc hydroxyapatite (ZnHAP) is an effective heterogeneous catalyst for the (2+3)‐cycloaddition of sodium azide with nitriles to afford 5‐substituted 1H‐tetrazoles in good yields. The catalyst is recovered and reused for several cycles with consistent activity.

Microwave assisted efficient synthesis of β-keto-sulfones in aqueous medium

Abstract An efficient synthesis of β-keto-sulfones is described. The reaction of α-haloketones with sodium alkyl/aryl sulphinates in aqueous medium under microwave irradiation afforded the corresponding β-keto-sulfones in excellent yields.