title: An expeditious synthetic approach towards the synthesis of Bis-Schiff bases (aldazines) using ultrasound.
abstract: Aldazines (Bis-Schiff bases) 1-24 were synthesized using aromatic aldehydes (heterocyclic and benzaldehydes) and hydrazine hydrate under reflux using conventional heating and/or via ultrasound irradiation using BiCl3 as catalyst. Ultrasonication conditions with cat. BiCl3 proved to be an effective, environmentally friendly synthetic procedure. This methodology is robust in the presence of electron donating and electron withdrawing groups affording desired products with high yields (>95%) in just a couple of minutes vs. hours using conventional heating.
authors.affiliation: H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan. Electronic address: hassaan2@super.net.pk.
authors.forename: Khalid M
authors.initials: KM
authors.lastname: Khan
authors.affiliation: H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan; Institute of Advance Research Studies in Chemical Sciences, University of Sindh Jamshoro, Hyderabad 76080, Pakistan.
authors.forename: Waqas
authors.initials: W
authors.lastname: Jamil
authors.affiliation: H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan.
authors.forename: Nida
authors.initials: N
authors.lastname: Ambreen
authors.affiliation: H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan; Research Institute of Natural Products for Drug Discovery (RiND), Faculty of Pharmacy, Universiti Teknologi MARA (UiTM), Puncak Alam Campus, 42300 Bandar Puncak Alam, Selangor Darul Ehsan, Malaysia.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Taha
authors.affiliation: PCSIR Laboratories Complex, Karachi, Shahrah-e-Dr. Salimuzzaman Siddiqui, Karachi 75280, Pakistan.
authors.forename: Shahnaz
authors.initials: S
authors.lastname: Perveen
authors.affiliation: Morales Consulting LLC, 11474 Perkins Street, Carmel, IN 46032, USA.
authors.forename: Guillermo A
authors.initials: GA
authors.lastname: Morales
mesh_terms: D060326:Chemistry Techniques, Synthetic / Q000379:methods*; D004579:Electron Transport; D007700:Kinetics; D012545:Schiff Bases / Q000138:chemical synthesis*; D014465:Ultrasonics
chemical_list: D012545:Schiff Bases
keywords: Aldazines (Bis-Schiff bases); High yielding method; Rapid; Ultrasonication