Synthesis, characterization and evaluation of 5-alkylidene meldrum’s acid derivatives as multifunction lubricating oil additives

A series of 5-alkylidene Meldrum s acid derivatives were prepared by Knovenagel condensation of Meldrum s acid with different aldehydes in the presence of pipridin as a catalyst. The prepared compounds were characterized by FT-IR, 1HNMR, and 13CNMR. Each prepared compound (0.2% wt. /wt.) was blended with base sixty stock lubricating oil to be evaluated as anti-rust and anti-corrosive additives according to ASTM-D665, and ASTM-D130 respectively. The formulated blend of some compounds showed better anti-rust and anti-corrosion properties compared with the base oil (blank) supplied by the Midland Refineries Company/Iraq.