الفهرس 
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Abstract
This work consists of four parts Part 1: In this part 2-amino thiophene -3-carboxylate (1) was used as starting material in the synthesis of some new compounds which have a considerable antioxidant properities for lubricating oils. Part 2: synthesis of substituted thieno-pyrimidinones and thieno-pyridinones Part 3:Efficient Synthesis of Some New Thiophene Based Heterocycles Part 4: Evaluation of the prepared compounds as antioxidant additives for the tested lubricating oil.