Solvent‐free Synthesis of 1,8‐Dioxo‐octahydroxanthenes and Tetra‐hydrobenzo[a]xanthene‐11‐ones over Poly(<i>N,N</i>′‐dibromo‐<i>N</i>‐ethylnaphtyl‐2,7‐sulfonamide)

Abstract

In this work, poly( N,N ′‐dibromo‐ N ‐ethylnaphtyl‐2,7‐sulfonamide) ( PDNES ) as a highly efficient catalyst was applied for the synthesis of 1,8‐dioxo‐octahydroxanthenes and tetra‐hydrobenzo[a]xanthene‐11‐ones under neutral and solvent‐free conditions.