Guertin, Donald L. published the artcileInfrared absorption of branched-chain fatty acids and derivatives in the carbon-hydrogen stretching region, Recommanded Product: 2-Butylhexanoic acid, the publication is Journal of the American Oil Chemists’ Society (1956), 172-4, database is CAplus.
Investigations of the LiF region make it possible to characterize a number of structural isomers of branched-chain fatty acids, such as 2-methyl-, 3-methyl-, and 5-methylhexanoic acids. Similarly, 2-propyl- and 2-isopropylhexanoic acids can be differentiated and 2-butylhexanoic acid can be identified. Absorption bands at 2960 cm.-1 and 2930 cm. -1 were assigned, resp., to asym. Me modes and in-phase vibrations of the methylene group. Absorption at 2870 cm.-1 is associated with symmetrical stretching modes of the Me group. The absorption at 2860 cm. -1 has been assigned to the out-of-phase vibrations of the methylene group. These assignments correspond to those of Fox and Martin (C.A. 34, 4989.6) and Pozefsky and Coggeshall (C.A. 46, 3857f). The absorption bands at 2930 cm. -1 and 2860 cm. -1 are stronger than those at 2960 cm.-1 and 2870 cm. -1 when the ratio of methylene groups to Me groups equals or exceeds 3 to 1. The one exception to this rule is the case of 2-methylhexanoic acid and the corresponding Ag salt and di-soap. An interaction between the Me group in the 2-position and the acid group has been proposed as an explanation for the case. As the spectra of the fatty acids and their Ag salt and Al di-soap derivatives are identical in the C-H region, it is obvious that other derivatives of these acids can be identified by reference to the spectra reported.
Journal of the American Oil Chemists’ Society published new progress about 3115-28-4. 3115-28-4 belongs to catalysis-chemistry, auxiliary class Aliphatic Chain, name is 2-Butylhexanoic acid, and the molecular formula is C10H20O2, Recommanded Product: 2-Butylhexanoic acid.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia