Affiliation: | 1. Department of Chemistry, Faculty of Science , Assiut University , Assiut, EGYPT;2. Department of Chemistry, Faculty of Science , Ain Shams University , Abbassia, Cairo, EGYPT;3. Department of Chemistry, Qena Faculty of Science , South Valley University , Qena, EGYPT;4. Institute of Organic Chemistry, University of Regensburg , 8400, Regensburg, GERMANY E-mail: salah_kamel2000@yahoo.com |