1,3-(4,4′-bipyridinium disulfonic acid) propane-dihydrogen sulfate as highly effectual bi-functional catalysts for the rapid preparing chromeno[4,3-b]chromenes and pyrido[2,3-d:6,5-d′]dipyrimidines

  • Abdelgadir Altoum
  • , Ebraheem Abdu Musad Saleh
  • , Anaheed Hussein Kareem
  • , Sana Shahab
  • , Maha Medha Deorari
  • , Dmitry Olgovich Bokov
  • , Usama S. Altimari
  • , Murtadha Laftah Shaghnab
  • , Ahmed Alawadi
  • , Ali Alsalamy

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Chemistry