الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Evaluation of TCS / ZnCl2 with acetic anhydride as an acetylating reagent for methylene ketones. A new route to prepare ?diketones which have good application in organic synthesis by the reaction of one mole of methylene ketones, four moles of acetic anhydride, two moles of TCS and two moles of ZnCl2 in the presence of methylene chloride as solvent at room temperature produce the corresponding ?diketones in excellent yield: Section (II) Novel synthesis of ? acyl amino ketones in one pot three components condensation of aldehyde, ketone and nitrile via TCSZnCl2 as coupling reagent. The reaction of methyl aromatic ketones, aromatic aldehydes and nitriles in the presence of methylene chloride as solvent at room temperature gives ?acyl amino ketones as a major products and chalcones as minor products, this illustrated in the following equations: Section (III) Efficient tetrachlorosilane zinc chloride mediated regioselective synthesis of functionalized triphenylmethane : When one mole of aromatic aldehydes and two moles of anisole are reacted in the presence of the binary reagent TCS/ ZnCl2 and in the presence of methylene chloride as solvent at room temperature, functionalized substituted triphenylmethane were obtained selectively in good yields. Section (IV) Chemoselective bromination in twostep substitution under influence of tetrachlorosilane and Nbromosuccinimide: In this part we study the new method to prepare ?, ?dibromo ketones which have many applications in organic synthesis this by the reaction of one mole of methylene ketone and two moles of TCS/ NBS in the presence of methylene chloride as solvent at room temperature yielded ?,?dibromo ketone.