The Plant Alkaloids by Thomas Anderson Henry

By Thomas Anderson Henry

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The best yield was obtained at pH 4-5, and appeared to be complete in forty hours. At pH 7 or 9, 11 or 13, the yield was very small. This synthesis under " physiological conditions " is represented as occurring in accordance with the following scheme :— ca. 2003 LOBELIA ALKALOIDS 27 The principal characteristics of the naturally occurring members of the lobeline group (see also Table A, p. " 130-1°, [

P. 62°, are precipitated as oils, but soon become crystalline. p. 192°. The cadmium iodide salt, B . HI. p. 146-7°, crystallises from water in long needles. y-Coniceine is a secondary base, and on reduction yields dl-coniine. 49 The Coniceines, C8H15N. 50 Their chief characteristics are tabulated below. a-Coniceine is perhaps the least well-defined of the six ; it is one component of the mixture resulting from the action of hydrochloric acid on conhydrine, and is described by Loffler 51 (1904) as stereoisomeric with e-coniceine (II).

1901, 34, 3166. , 1909, 42, 107. (35) Cf. PLANTA and KEKULE, Annalen, 1854, 89, 150. , 1891, 24, 1678. , 1917, 50, 1386 ; 1919, 52, 1622 ; 1920, 53, 129. (38) Annalen, 1856, 100, 1329. , 1909, 42, 107. , 1933, 63, 127. , 1909, 42, 929. , 1917, 50, 1386 ; 1919, 52, 964 ; 1920, 53, 119 ; Annalen, 1925, 441, 101 ; cf. , 1928, 462, 301. , 1891, 24, 2530; 1894, 27, 1775. , 1891, 24, 1071. , 1909, 42, 116, 960. , 1941, 74, 599. , 1885, 18, 109. , 1890, 23, 680. , 1909, 42, 4059. , 1904, 37, 1895 ; 1909, 42, 946.

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