Heterocyclic compounds useful as additives for lubricant and fuel compositions

An additive for functional fluids prepared by the process of reacting:

• (I) at least one reactant of the formula:
• ##STR13## wherein Z is S, NR', ##STR14## PR' or PR'A where A is O or S and R' is H, alkyl or alkenyl;
• p is 0 to 2;
• e is 0 to 2 wherein e+p is 2 to about 4;
• X is independently H, COOH, NH.sub.2, CONH.sub.2, NHNH.sub.2, OR', COR', NHR', OH, SH or CN, where R' is the same as defined above;
• wherein T is NH.sub.2, NHR' where R' is the same as defined hereinabove, SH, OH or their tautomers;
• and Y is CN, CO.sub.2 H, ##STR15## or CH.sub.2 NH.sub.2 wherein A is the same as defined hereinabove;
• with (II) at least one reactant selected from the group consisting of hydrocarbyl substituted carboxylic acid or derivatives thereof, hydrocarbyl phenolic reactant, or mixtures thereof;
• wherein the reactants are heated to a temperature of from about 80.degree. C. to the decomposition temperature of the mixture to effect acylation or condensation reaction, and wherein from about 0.25 to about 2.0 equivalents of reactant (I) is reacted with each equivalent of the hydrocarbyl carboxylic acid or derivative thereof and/or hydrocarbyl phenolic reactant.