الفهرس 
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Abstract
This thesis is divided into three chapters. The
first section of chapter I comprises survey of the litera-
ture reports on the chemical synthesis of u, u’-trehalose
derivatives. The second section of chapter I comprise
A survey of the litertaure reports on the chemical synthe- sis of lipid A and the different coupling methods for the
synthesis of oligosaccharides The first section of chapter 11 is devoted to the synthesis.