3-Chloro-2-hydroxypropanoic Acid

This compound is typically obtained as a colorless to pale yellow viscous liquid or low-melting solid. Its molecular formula is C3H5ClO3, corresponding to a molecular weight of 124.52. The boiling point is approximately 115–120 °C at reduced pressure (1 mmHg), with a calculated density near 1.56 g/cm³ at 20 °C. It is freely soluble in water and polar organic solvents including methanol, ethanol, and acetone, while showing moderate solubility in ethyl acetate and limited solubility in nonpolar solvents such as diethyl ether and hexane. The molecule contains both a carboxylic acid and a secondary alcohol functionality, along with a chlorine atom on the adjacent carbon. The compound exists as a racemic mixture due to the chiral center at the 2-position. It is hygroscopic and may absorb moisture upon prolonged exposure to air. Storage in tightly sealed containers under inert atmosphere at reduced temperature (2–8 °C) is recommended to prevent decomposition. Contact with strong bases, strong oxidizing agents, and nucleophiles should be avoided.

3Chloro2hydroxypropanoic acid is a chiral, bifunctional molecule featuring a carboxylic acid, a secondary alcohol, and a primary chlorine atom on a threecarbon backbone. This structural arrangement places the halogen on the carbon adjacent to the hydroxyl-bearing stereocenter, creating a versatile synthon for further transformations. The carboxylic acid provides acidic functionality and a handle for amide or ester formation, while the hydroxyl group can participate in oxidation, etherification, or act as a directing group. The chlorine atom serves as an electrophilic site for nucleophilic substitution, enabling introduction of amines, thiols, or other nucleophiles. The compound is structurally related to lactic acid but with the methyl group replaced by a chloromethyl unit, imparting distinct reactivity. This compact, multifunctional scaffold is valuable in organic synthesis for constructing more complex molecules, particularly in the preparation of chiral building blocks and biologically active compounds.

Pharmaceutical Intermediate
This chlorinated hydroxy acid is employed in the synthesis of various therapeutic agents, including anticoagulants and enzyme inhibitors. The chiral center allows for resolution or asymmetric synthesis to obtain enantiomerically pure compounds. The carboxylic acid enables amide coupling with amine-containing pharmacophores, while the chlorine can be displaced to introduce diverse functional groups for optimizing biological activity.

Building Block for Chiral Synthesis
The compound serves as a starting material for preparing chiral epoxides, aziridines, and other strained ring systems through intramolecular cyclization reactions. Treatment with base induces epoxide formation via intramolecular Williamson ether synthesis, yielding glycidol derivatives that are valuable intermediates in asymmetric synthesis. These epoxides undergo regioselective ring-opening with various nucleophiles to access enantiomerically enriched compounds.

Synthetic Intermediate for Glycerol Derivatives
This hydroxy acid is a precursor to functionalized glycerol analogs and phospholipid building blocks. Reduction of the carboxylic acid to the corresponding alcohol yields chloropropanediol derivatives, which can be further elaborated to produce surfactants, emulsifiers, and membrane components. These materials find applications in cosmetics, pharmaceuticals, and food technology.

Organic Synthesis Building Block
As a versatile synthetic intermediate, 3chloro2hydroxypropanoic acid participates in diverse transformations including nucleophilic substitution at the chlorine site, oxidation of the secondary alcohol to a ketone, and protection of the hydroxyl and carboxyl groups for sequential functionalization. It serves as a precursor to 2hydroxypropanolamine derivatives and other compounds with applications in medicinal chemistry and materials science. The chlorine can be converted to azide for click chemistry applications or to thiol for metal surface functionalization.