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

Abstract

Pyrimidine-5-carboxylate derivative Ia was utilised as a key intermediate for the synthesis of new pyrimidine 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.

Studies On Some Thiazolidinones As Antioxidants For Local Base Oil

“…Consequently, the addition of antioxidants became very required to protect the oil by decreasing the oxidative degradation during industrial application [5]. Most of the heterocyclic compounds which have compact structure possess antioxidant, anticorrosion and antiwear properties [6][7][8]. Heterocyclic compounds have been reported as antiwear and extreme pressure additives such as thiadiazoles and benzotriazoles [9][10][11][12][13].…”

Synthesis and Applications of Pyridazinones for Base oil Improvement

“…In order to see the technical economic and environmental requirements, sulfur and phosphorus content are used in the design of lubricating oil with lo w concentration [3,4]. The co mpact structure of heterocyclic co mpounds, lead to possess antioxidant, anticorrosion and anti-wear properties [5][6][7]. So me functionalized imidazo les and 1,2,4-t riazoles are tested as antioxidant additives for industrial lubricating oils [8].…”