For the history of early research on picoline, see:
Gmelin, Leopold (1857). Handbook of Chemistry. Vol. 11. Translated by Watts, Henry. London, England: Cavendish Society. pp. 263–272.
Koerner, W. (1869). "Synthèse d'une base isomère à la toluidine" [Synthesis of a base [that is] isomeric to toluidine]. Giornale di Scienze Naturali ed Economiche (Journal of Natural Science and Economics (Palermo, Italy)) (in French). 5: 111–114.
Weidel, H. (1879). "Studien über Verbindungen aus dem animalischen Theer" [On studies of compounds from animal tar]. Berichte der Deutschen Chemischen Gesellschaft (in German). 12 (2): 1989–2012. doi:10.1002/cber.187901202207. From p. 2008: "Eine vollständige Trennung gelingt nur durch die Platindoppelsalze. Das des α-Picolins (wie ich es nennen will) ist schwerer löslich als jenes des β-Picolins." (A complete separation [of the two isomers] succeeds only via their double salts with platinum. That [double salt] of α-picoline (as I will call it) is less soluble than that of β-picoline.) From p. 2011: "Es kann daher Baeyer's aus Acroleïnammoniak gewonnene Base vielleicht als das dritte, nach Koerner's Auffassungsweise mögliche γ-Picolin betrachtet werden." (Thus Baeyer's base that was obtained from acroleïnammoniak can perhaps be regarded, according to Körner's interpretation, as the third possible [isomer], γ-picoline.)
Sims, G. K.; Sommers, L.E. (1985). "Degradation of pyridine derivatives in soil". Journal of Environmental Quality. 14 (4): 580–584. doi:10.2134/jeq1985.00472425001400040022x.
Sims, G. K.; Sommers, L.E. (1986). "Biodegradation of pyridine derivatives in soil suspensions". Environmental Toxicology and Chemistry. 5 (6): 503–509. doi:10.1002/etc.5620050601.
hathitrust.org
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Unverdorben, Otto (1826). "Ueber das Verhalten der organischen Körper in höheren Temperaturen" [On the behavior of organic substances at high temperatures]. Annalen der Physik und Chemie. 2nd series (in German). 8: 253–265, 477–487. Unverdorben named picoline Odorin on p. 255.
Dewar, James (27 January 1871). "On the oxidation products of picoline". Chemical News. 23: 38–41. From p. 40: "If we consider picoline as in all likelihood methylpyridine, … "
Weidel, H. (1879). "Studien über Verbindungen aus dem animalischen Theer" [On studies of compounds from animal tar]. Berichte der Deutschen Chemischen Gesellschaft (in German). 12 (2): 1989–2012. doi:10.1002/cber.187901202207. From p. 2008: "Eine vollständige Trennung gelingt nur durch die Platindoppelsalze. Das des α-Picolins (wie ich es nennen will) ist schwerer löslich als jenes des β-Picolins." (A complete separation [of the two isomers] succeeds only via their double salts with platinum. That [double salt] of α-picoline (as I will call it) is less soluble than that of β-picoline.) From p. 2011: "Es kann daher Baeyer's aus Acroleïnammoniak gewonnene Base vielleicht als das dritte, nach Koerner's Auffassungsweise mögliche γ-Picolin betrachtet werden." (Thus Baeyer's base that was obtained from acroleïnammoniak can perhaps be regarded, according to Körner's interpretation, as the third possible [isomer], γ-picoline.)
