الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The increasing demand for economical and environmentally friendly synthesis is a major challenge of modem chemistry. Therefore, the development of time, energy and material saving one-pot synthesis is an active research area 1-3 Powerful and selective reagents allowing clean reactions under mild conditions are a basic prerequisite for efficient onepot synthesis, otherwise only complex product mixtures would be obtained
and tedious purification procedures and poor yields be the consequence. A large number of silicon reagents are exceUent examples for reagents meeting these special requirements and have been utilized successfully in achieving a multitude of chemical transformations in high yield under mild and neutral conditions.
The use of silicon reagents has become significant during the last three decades in modern chemistry.4-8 New organosilicon reagents have been developed and silyating synthons are being widely used in the activation of a substrate or in a specific manner9• The high bond energy of the oxygen-silicon bond ( 90-110 k.cal/mole) makes it thermodynamically very favorable to use a reagent with a weak silicon-halogen bond and react it with an appropriate oxygen containing organic molecule to form an oxygen-silicon intermediate. which can be transformed to another in a subsequent step10 .
Accordingly. the present survey is divided into two Parts where the first part is focused on the synthetic potentialities of some halosilanes, a class of great value reagents in organic synthesis. More specially, the fundamental treatise was directed to the useful synthetic applications of tetrachlorosilane. a cheap, safe and easily handled reagent .