Synthesis and applications of some new antioxidant and anticorrosive additives for Egyptian diesel motor oils

摘要

Pyrimidine-5-carboxylate derivative Ia was utilised as a key intermediate for the synthesis of new pyrimi-dine derivatives. Thiopyrimidine derivative Ia undergo N-methylation using methyl iodide afforded III. Methylsulfanyl moiety in II was easily removed when reacted with phenyl hydrazine and thiosemicarbazide afforded pyrimidine derivatives IV and VI, respectively. The reaction on nitrogen atom in Ia using 1,3-dibromo-propane, benzoyl chloride, phosphorous oxychloride afforded VIII, IX and X, respectively. The reaction using 1,3-dibromo-propane or 1,2-dibromo-ethane furnished the formation of the corresponding fused cycles containing sulfur. Representative compounds of the synthesised products were evaluated as antioxidant and corrosion inhibitors for gasoline lube oils.