CAS No 565-74-2 , 2-bromo-3-methylbutanoic acid

Title: a-Bromoisovaleric Acid
CAS Registry Number: 565-74-2
CAS Name: 2-Bromo-3-methylbutanoic acid
Molecular Formula: C5H9BrO2
Molecular Weight: 181.03
Percent Composition: C 33.17%, H 5.01%, Br 44.14%, O 17.68%
Line Formula: (CH3)2CHCHBrCOOH
Literature References: Prepn of dl-form: Ley, Popow, Ann. 174, 61 (1874); Smissman, J. Am. Chem. Soc. 76, 5805 (1954); Marvel, Org. Synth. coll. vol. III, 848 (1955). Prepn of d- and l-forms: Berlingozzi, Furia, Gazz. Chim. Ital. 56, 82 (1926); Berlingozzi, Lenoci, ibid. 68, 721 (1938). Configuration of d-form: Brewster et al., Nature 166, 179 (1950).
 
Derivative Type: dl-Form
Properties: Prisms from ether or chloroform, mp 44°. bp ~230° with some decompn. Sparingly sol in water; sol in alcohol, ether.
Melting point: mp 44°
Boiling point: bp ~230° with some decompn
 
Derivative Type: d-Form
Properties: Crystals from petroleum ether, mp 43-44°. [a]D20 +22.6° (c = 4 in benzene).
Melting point: mp 43-44°
Optical Rotation: [a]D20 +22.6° (c = 4 in benzene)
 
Derivative Type: l-Form
Properties: Crystals from petroleum ether, mp 43-44°. [a]D20 -22.4° (c = 4 in benzene).
Melting point: mp 43-44°
Optical Rotation: [a]D20 -22.4° (c = 4 in benzene)