Synthesis and application of cross-linked poly (1-sulfonic acid 4-vinylpyridinum chloride) as a heterogeneous polymeric BrØnsted acidic ionic liquid catalyst in organic reactions

The use of ionic liquid in catalysis is attracting more and more attention in the field of chemistry. Polymeric ionic liquids or poly (ionic liquid)s (PILs) refer to a special type ofpolyelectrolytes which carry an IL species in each of the repeating units. Thus, the cationic or anionic centers areconstrained to the repeating units in the polymer chain [1].Polymeric supports containing nitrogen as donor atoms are of special interest because some of their correspondingquaternary ammonium salts have represented as a class of PILs [2]. One of such polymers is polyvinylpyridine (PVPy)which is a functional polymer that potentially might be used for preparation of the corresponding quaternary salts by attaching of catalysts or reagents to the nitrogen atom ofpyridine ring. In continuation of our research in synthesis of cross-linked polymers and their application in catalytic reactions [3-4], inthis work we explain synthesis and applications of crosslinked Poly (1-sulfonic acid 4-vinylpyridinum chloride) as heterogeneous catalyst polymeric BrØnsted acidic ionic liquid in synthesis of quinoxalines