2- -1,2-hydroxypropanoic

Methanoic acid Ethanoic acid Octadecanoic acid 2 Hydroxypropanoic acid... 

Other Syntheses. Acryhc acid and other unsaturated compounds can also be made by a number of classical elimination reactions. Acrylates have been obtained from the thermal dehydration of hydracryhc acid (3-hydroxypropanoic acid [503-66-2]) (84), from the dehydrohalogenation of 3-halopropionic acid derivatives (85), and from the reduction of dihalopropionates (2). These studies, together with the related characterization and chemical investigations, contributed significantly to the development of commercial organic chemistry. 

Lactic acid [50-21-5] (2-hydroxypropanoic acid), CH CHOHCOOH, is the most widely occurring hydroxycarboxylic acid and thus is the principal topic of this article. It was first discovered ia 1780 by the Swedish chemist Scheele. Lactic acid is a naturally occurring organic acid that can be produced by fermentation or chemical synthesis. It is present ia many foods both naturally or as a product of in situ microbial fermentation, as ia sauerkraut, yogurt, buttermilk, sourdough breads, and many other fermented foods. Lactic acid is also a principal metaboHc iatermediate ia most living organisms, from anaerobic prokaryotes to humans. 

Oxidation. Monochloroacetic acid [79-11-8] may be synthesized by the reaction of ethylene chlorohydrin with nitric acid [7697-37-2]. Yields of greater than 90% are reported (41). >Beta-chlorolactic acid (3-chloro-2-hydroxypropanoic acid) [1713-85-5] is produced by the reaction of nitric acid with glycerol monochlorohydrin (42). Periodic acid [10450-60-9] and glycerol monochlorohydfin gives chloroacetaldehyde [107-20-0] ia 50% yield (43). 

For some years, this type of vehicle was used in anionic electro deposition primers. However for automobiles cationic electro deposition primers are now preferred. The vehicles for cationic primers are proprietary but probably consist of the reaction product of epoxy resins and polyfunctional amines solubilized by the conversion of amine groups into salts using an acid such as lactic acid (2-hydroxypropanoic acid) [50-21-5] Alcohol-blocked... 

The crystal structure of the adduct of titanium tetrachloride and the ester formed from ethyl 2-hydroxypropanoate (ethyl lactate) and acrylic acid has been solved. It is a chelated structure with the oxygen donor atoms being incorporated into the titanium coordination sphere along with the four chloride anions. 

Chemical Designations - Synonyms Ethyl Alpha-hydroxy-propionate Ethyl 2-hydroxypropanoate Ethyl DL-Lactate Lactic Acid Ethyl Ester Chemical Formula CH3CHOHCOOC2H3 Observable Characteristics - Physical State (as shipped) Liquid Color Colorless Odor Mild characteristic. 

Chemical Designations - Synonyms 2-Hydroxypropanoic acid alpha-Hydroxypropionic acid Milk acid Racemic acid Chemical Formula CHjCHOHCOOH-HjO. 

Molecules that are not identical to their mirror images are kinds of stereoisomers called enantiomers (Greek encmtio, meaning "opposite"). Enantiomers are related to each other as a right hand is related to a left hand and result whenever a tetrahedral carbon is bonded to four different substituents (one need not be H). For example, lactic acid (2-hydroxypropanoic acid) exists as a pair of enantiomers because there are four different groups (—H, -OH, - CH3, -C02H) bonded to the central carbon atom. The enantiomers are called (-i-)-lactic acid and (-)-lactic acid. Both are found in sour milk, but only the (+) enantiomer occurs in muscle tissue. 

Isopropyl 3-hydroxypropanoate (lwo words, because "propanoate" is not a compound)... 

Hydroxy-1-propanesulfonic acid y-sultone, pi97 2-Hydroxypropanoic acid, LI, L2... 

S)-(-)-2-Bromo-3-hydroxypropanoic acid Propanoic acid, 2-bromo-3-hydroxy-,... 

Two propanoate units (see Fig. 2) seem to be coupled in 1-ethylpropyl (2S,3.R)-2-methyl-3-hydroxypropanoate 221, the male produced aggregation pheromone of the granary weevil, Sitophilus granarius [390-393]. Even the ester-moiety may origin from two propanoate units after decarboxylation and reduction Three propanoate units (and decarboxylation, see Fig. 2) may produce (4S,5 )-5-hydroxy-4-methyl-3-heptanone, sitophilure 222, the aggregation pheromone of the rice weevil, Sitophilus oryzae [394, 395]. The same carbon skeleton is present in the achiral 4-methylheptan-3,5-dione 223, the pheromone of the pea weevil, Sitona lineatus [396-398]. 

Serine (Ser or S) ((S)-2-amino-3-hydroxypropanoic acid) is a polar, neutral, uncharged amino acid with the formula H00CCH(NH2)CH20H. It has an aliphatic hydroxyl side chain and can be seen as a hydroxylated version of Ala. Ser participates in the biosynthesis of purines and pyrimidines and is also the precursor to several amino acids including Gly, Cys, and Trp (in bacteria). In addition, it is the precursor to numerous other metabolites, including sphingolipids and is present in enzymes such as a-chymotrypsin. Ser, Asn, and aspartate disrupt a helices. 

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