Ethoxyquin: An Antioxidant Used in Animal Feed

Table 2

Physical and chemical properties of ethoxyquin.

Properties of EQ
Molecular formula	C14H19NO
Molecular mass	217.34 [g mol^−1]
IUPAC name	1,2-dihydro-2,2,4-trimethylquinolin-6-yl ethyl ether
CAS name	6-ethoxy-1,2-dihydro-2,2,4-trimethylquinoline
Chemical class	Quinoline
Melting point	0°C^a
Boiling point	123–125°C at 2 mm Hg^a
Solubility	Insoluble in water, soluble in fat and animal and plant oils, and soluble in ethanol, methanol, DMSO, and DMF
Vapor density	7.48 (AIR = 1)^a
Stability	Stable under ordinary conditions, storage temp. 0–6°C
Spectral properties	Index of refraction: 𝑛𝐷 1.569–1.672 at 25°C^a
	Max absorption: 354 nm. Intense mass spectral peaks: 202 m/z (100%), 108 m/z (53%), 174 m/z (48%), and 137 m/z (36%)^a
	^13C NMR in CDCl3 EQ (8% solution) 𝛿𝐶 in ppm: 151.2 (EQ-C-6); 137.6 (EQ-C-4); 129.5 (EQ-C-3); 128.5 (EQ-C-9); 122.8 (EQ-C-10); 114.6 (EQ-C-8); 113.6 (EQ-C-7); 111.1 (EQ-C-5); 64.2 (EQ-CH2-O); 51.6 (EQ-C-2); 30.4 (EQ-CH3-4); 18.5 (EQ-CH3-4); 15.0 (EQ-CH3-CH2-O-)^b

aAccording to the National Library of Medicine HSDB Database (last revision date: 2003) [18].
^bAccording to Błaszczyk and Skolimowski [19].
DMSO: dimethyl sulfoxide, DMF: N,N-dimethylformamide.