View of 1,4-Disulfopiperazine-1,4-diium chloride ([Piper-(SO3H)2].2Cl) as an efï¬cient ionic catalyst for synthesis of phthalazine derivatives | Iranian Journal of Catalysis

1,4-Disulfopiperazine-1,4-diium chloride ([Piper-(SO3H)2].2Cl) as an efï¬cient ionic catalyst for synthesis of phthalazine derivatives