“…A valeric acid was isolated from fresh Hungarian tobacco leaf, although the evidence presented for its being the iso compound is somewhat slender (104). Recent investigations of Japanese Virginia tobaccos have confirmed the presence of formic, acetic, and /3-methylvaleric acids and demonstrated the existence of several more (220,221,222). The acids were first chromatographed on silicic acid and then converted to p-bromophenacyl esters which were compared with samples of authentic specimens; in this way ircros-crotonic, propionic, methylethylacetic, n-caproic, phenylacetic acids, and, possibly, isobutyric acid were identified.…”
“…A valeric acid was isolated from fresh Hungarian tobacco leaf, although the evidence presented for its being the iso compound is somewhat slender (104). Recent investigations of Japanese Virginia tobaccos have confirmed the presence of formic, acetic, and /3-methylvaleric acids and demonstrated the existence of several more (220,221,222). The acids were first chromatographed on silicic acid and then converted to p-bromophenacyl esters which were compared with samples of authentic specimens; in this way ircros-crotonic, propionic, methylethylacetic, n-caproic, phenylacetic acids, and, possibly, isobutyric acid were identified.…”
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