الفهرس 
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Abstract
this thesis includes five chapters,the first of which is devoted to the nomenclature of&and B-tetronic acids which are also known as &-hydroxy-and B-hydrox-&,B-unsaturated-&-corotonolactones,respectively .the imide of B-tetronic acid,namely tetronic is also known as B-Hydroxycrotonimidic-&-lactone the occurrence of the tetronic acid nucleus in naturale products as well as in synthetic medicinal agents is also indicated in this chapter..