Chemical Properties and Structure
Dimethylolpropionic acid (DMPA) is an organic compound that belongs to the class of beta-hydroxy carboxylic acids. Its chemical formula is C5H10O4 and molecular weight is 134.13 g/mol. DMPA has two hydroxyl groups, one carboxyl group, and a three carbon chain. The hydroxyl groups are attached to the beta carbon atoms, giving DMPA additional reactivity compared to simple carboxylic acids. DMPA exists as a crystalline solid at room temperature, with a melting point of around 100°C. It is readily soluble in water, alcohols, and other polar organic solvents.
In its solid state, Dimethylolpropionic Acid forms hydrogen bonds between molecules due to the presence of hydroxyl and carboxyl groups. In solution, it dissociates to form an anion with one proton detached from the carboxyl group. The pKa values of DMPA have been reported as 4.5 for the first hydroxyl group and 9.5 for the second hydroxyl group. This indicates that DMPA exists predominantly as a monoanion under normal ambient conditions. The additional hydroxyl groups make DMPA a versatile building block for chemical reactions.
Synthesis and Production
Industrially, dimethylolpropionic acid is produced via the oxidation of 2,2-dimethyl-1,3-propanediol (DMP) using performic acid as the oxidizing agent. DMP is readily available through the hydration of isobutylene. Performic acid is generated in situ from formic acid and hydrogen peroxide. This reaction proceeds smoothly at room temperature to afford high yields of DMPA.
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