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  1. Visiting Lecturer: at Sanford University England for 6 months (Sept. 72 to Feb.73). 

  1. Visiting Professor: at the Section of Chemistry Leipzig University Germany, (Sept. 1980). 

  1. Visiting Professor: at Institute of Organic Chemistry Achen, Germany during May (1981) & June (1982).

  1. Visiting Professor: at University of California, Berkeley, U.S.A May (1982). 

  1. Visiting Professor: at Institute of Organic Chemistry, University of Regenesburg, Germany, Sept.(1983), July (1991). 

  1. Visiting Professor: at Institute of Organic Chemistry, Technical University of Vienna, Austria, June (1985), July (1991). 

  1. Visiting Professor: at Institute of Organic Chemistry, Perugia, Italy Sept. (1993).

  1. Visiting professor: at College f Natural Sciences Dept. of Chemistry and Biochemistry, University of Texas at Austin (USA) May 1997, May 1998.

  1. Visiting Professor: at Center of Heterocyclic Compounds, University of Florida, Gainesville. (May 1998).

10. Visiting Professor: at Department of Chemistry, University of British Columbia, Canada (May 1998).

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