Verschaffelt3) had pointed out that the odor of the flowers of Robinia Pseudacacia, L. (family Leguminosae) indicated the presence of methyl anthranilate. That the flowers contain this ester was demonstrated by F. Elze4). He extracted the flowers with a readily volatile solvent and obtained a dark brown oil (yield not mentioned) with a peculiar basic odor which, however, faithfully reproduced the fragrance of the flowers upon dilution. The oil had the following constants: b. p. 60 to 150° (5 mm.); d15ol,05; it contained 9 p.c. ester computed as methyl anthranilate. Its alcoholic solution had a decided blueish fluorescence.
The following constituents were identified: anthranilic acid methyl ester (m. p. 25°), indol (m. p. 52°), traces of pyridine-like bases, heliotropin (m. p. 37°; m. p. of semicarbazone 235°), benzyl alcohol (d15o1,048), linalool (oxidation to citral) and a-terpineol (m. p. of phenyl urethane 111°). In addition aldehydes and ketones, with a decided odor of peach, and probably also nerol are present.
1) Report of Schimmel & Co. October 1894, 73.
2) Verslag's Lands Plantentuin te Buitenzorg 1894, 44; Report of Schimmel & Co. April 1896, 70.
3) Chem. Weekblad 1908, No. 25. 4) Chem. Ztg. 34 (1910), 814.