The Synthesis and Evaluation of Some New Quinazolones as Antioxidant Additives for Egyptian Lubricating Oils

Abstract

4-(4-oxo-4H-benzo[d][1,3]oxazin-2-yl)phenyl-4-methylbenzenesulfonate 2 was prepared and reacted with some nitrogen and sulfur nucleophiles. The prepared products were evaluated as antioxidant and corrosion inhibitors for gasoline lubricating oil in which compounds, 4-(3-amino-4-oxo-3,4-dihydroquinazolin-2-yl)phenyl-4-methylbenzene sulfonate 12, 4-(3-(3-chloro-2-oxo-4-phenylazetidin-1-yl)-4-oxo-3,4-dihydroquinazolin-2-yl)phenyl 4-methylbenzenesulfonate 14, 4-(4-oxo-3-(4-oxo-2-phenylthiazolidin-3-yl)-3,4-dihydroquinazolin-2-yl)phenyl 4-methylbenzenesulfonate 15, and 4-(3-(1,3-dioxoisoindolin-2-yl)-4-oxo-3,4-dihydroquinazolin-2-yl)phenyl 4-methylbenzenesulfonate 18 exhibited the highest antioxidant activity. It was interesting also to study the effect of concentration of additive 15 to find the optimum concentration recommended to be used, 0.1 g for 1 L oil of additive 15 was the more effective concentration to be used. Also, measurements of thermal analyses were carried out.

Keywords:

• antioxidant and anticorrosive additives
• benzoimidazole
• benzoxazinone
• quinazolinone