Mellites

Mellites are a class of natural organic compounds that are esters of mellitic acid. Mellitic acid, also known as benzenehexacarboxylic acid, is a hexavalent aromatic acid with the chemical formula C6(CO2H)6. Mellites are typically found as mineraloid substances, often associated with the weathering of coal and other carbonaceous materials. They are generally amorphous or cryptocrystalline solids.

The chemical structure of mellites consists of a central benzene ring with six carboxylate groups attached. When these carboxylate groups are esterified with alcohols, they form mellites. The natural occurrence of mellites is relatively rare, and they are often found in sedimentary rocks, particularly lignites and coals. They can also be present in certain types of clays and soils.

Properties of mellites vary depending on the specific alcohol that has esterified the mellitic acid. However, they are generally insoluble in water and soluble in organic solvents. Their color can range from yellow to brown. Mellites have been studied for their potential in various applications, including as components in resins, as chelating agents, and in the study of organic geochemistry. Their formation is thought to involve oxidation processes of organic matter.