Beta-Hydroxybutyric acid

• 3-hydroxybutyric acid
• β -hydroxybutyric acid

• 300-85-6 ( unspecified mixture of enantiomers )
• 625-72-9 [(R )-3- hydroxybutyric acid ]
• 6168-83-8 [(S )-3- hydroxybutyric acid ]
• 625-71-8 [( ±)- 3-hydroxybutyric acid ]

Colorless liquid with an unpleasant odor

Liquid

1.16 g · cm -3

118-120 ° C (3 hPa)

• Slightly soluble in water (at 20 ° C)
• Soluble in ethanol and diethyl ether

Attention

Template: Infobox chemical / molecular formula search available

3- hydroxybutanoic acid outdated, and 3- hydroxybutyric acid is a chemical compound selected from the group of the substituted carboxylic acids and substituted alcohols. It occurs in two enantiomeric forms [(R )-3- hydroxybutyric acid and (S )-3- hydroxybutyric acid ]. Its salts are called 3- hydroxybutyrate.

Occurrence

D-3- hydroxybutyric acid occurs naturally in the metabolism of animals, it is one of three so-called ketone bodies. It is produced in the liver from acetoacetic acid by means of the enzyme D- beta-hydroxybutyrate dehydrogenase. It is excreted in the urine, where the proportion is increased there in ketosis ( acetonuria ).

Representation

From acetoacetic ester formed by reaction with sodium amalgam in the cold 3- hydroxybutyric acid.

Of 1- chloro-2 -propanol, the corresponding nitrile is formed with potassium cyanide in ethanol, which can be converted by hydrolysis to 3- hydroxybutyric acid.

Reactions

Upon heating of 3- hydroxybutyric acid formed with elimination of water crotonic

Use

Industrially, 3- hydroxybutanoic acid are used for the preparation of biodegradable plastic materials ( polyhydroxy butyric acid ).