الفهرس 
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Abstract
This thesis aime to study and prepare new Silicon reagents drived from reaction of Tetrachlorosilane with sodium azide , potassium cyanide , absolute ethanol and sodium sulfide and to study their synthetize application in organic synthesis . all these in situ reagents have been used to prepare facile synthesis of some tetrazole or tetrazolinm derivatives , cyanohydrines , coumarin 3 carbonitrile and dibenzospiro pyrane derivatives with expected biological activity .