الفهرس 
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Abstract
This thesis includes three chapters:
The first one covers the literature concerning the preparation and reactions of dibromo compounds with different nucleophiles.
The second chapter is divided into two parts:
The first part describes the method of preparation of methyl- 2,3-dibromo-3-(p-substituted phenyl) propanoates a-d and the products obtained from their reactions with piperidine in methanol.
The second part of chapter II includes the kinetic data and the procedure to determine the rate constants of forma- tion of (2) methyl-u-bromo-p- substituted cinnamates a-d.
The third chapter deals with the study and interpre- tation of the products obtained from the reactions of piperidine with erythro-methyl-2,3-dibromo-3-(p-substituted phenyl) propanoates a-d in absolute methanol.
Br.
Ar
H
CH,000
Ja-d
a, Ar- CH; b, Ar= p-cil,C6H4; c, Ar= p-c1c4; d, Ar= p-NO2C6H4.