الفهرس 
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Abstract
Foremost, I would like to express my sincere gratitude to my advisor Prof. Dr. Mohamed Saleh Abdelfattah, Prof. of Organic Chemistry, Department of Chemistry, Faculty of Science, Helwan University, for the continuous support of my PhD study and research, for his patience, motivation, enthusiasm. His guidance helped me in all the time of research and writing of this thesis.
Besides my advisor, I would like to thank Prof. Dr. Galal Hamza Elgemeie, Prof. of Organic Chemistry, Department of Chemistry, Faculty of Science, Helwan University, for his encouragement and guidance.
I’d like to gratefully thanking Assoc.Prof. Dr. Mayyada M. H. El- sayed, Associate Professor of Chemical Engineering, Chemistry Department, The American University in Cairo for her encouragement, insightful comments and support in every phase in this study. I could not have imagined having a better advisor for my PhD study.
I’d like to thank Prof. Dr. Alaa S. Marzouk, Professor of Pesticides Chemistry and the Head of Phytotoxicity Department Central,
Agricultural Pesticides Lab, Agricultural Research Center, for his encouragement and guidance.
I am grateful Dr. Zeinab Farag, lecturer of plant physiology lab, Department of plant, Faculty of Science, Helwan University, for her effort, support, encouragement and guidance.
I am grateful to Miss Hania A. Guirguis, master student from the Chemistry department in the American university in Cairo for assistance.
I am grateful to Mr. Emad Raafat, Mr. Ali Reda, Mr. Ahmed Omia, Mr. Samir Nabhan and Mr. Mahmoud from the Chemistry department in the American university in Cairo for assistance.
Last but not the least; I would like to thank my family for their supporting me spiritually throughout my life.