Identification of minor cyclic fatty acids in fractionated tall oil

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Abstract
The structure of several minor cyclic fatty acids present in Finnish tall oil fatty acids are elucidated by gas chromatography‐mass spectrometry. The origin and mechanism of formation of these cyclic fatty acids are discussed. The cyclic fatty acids identified in tall oil fatty acids are: 4‐(5‐pentyl‐3a,4,7,7a‐tetrahydro‐4‐indanyl)butanoic acid,ω‐(o‐alkylphenyl)alkanoic acid, 2,6‐dimethyl‐9‐(3‐isopropylphenyl)‐6‐nonenoic acid, 4‐(5‐pentyl‐4‐indanyl)butanoic acid, and 4‐(2‐hexyl‐1,2,4a,5,6,7,8,8a‐octahydro‐1‐naphthyl)butanoic acid. In addition, three different branched or cyclic unsaturated C19 fatty acids are reported to be present in tall oil.

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