Wakeman—Pigments of Flowering Plants. 
855 
Rhamnazin occurs in the fruit of Rhamnus infectoria, 1 and 
perhaps in other species of Rhamnus. Pure rhamnazin forms 
yellow needle like crystals which melt at 214°-215° and some¬ 
what resemble anthraquinone in appearance. They are less 
soluble in acetic acid than are those of quercetin and very 
slightly soluble in alcohol. Prom acetic acid rhamnazin cry¬ 
stallizes with one molucule of water of crystallization which it 
loses at 100°. It dissolves easily in alkalies with an orange red 
color, with lime or baryta water it gives an insoluble orange red 
precipitate. The alcohol solution gives an olive green coloration 
with ferric chloride. ' It forms a triacetyl, also a trobenzoyl 
derivative. 
Morin, — Penthydroxy- 1, 3 , 2', 4', a-flavone, or 
Tetrahydroxy- 1, 3 , 2', 4 ' - flavonol. 
Morin was first found by Chevreul 1 in yellow wood, Morns 
tinctoria t in 1830, and later by Perkin and Cope 2 in the Indian 
dye stuff Artocarpus tinctoria. It closely resembles quercetin 
in appearance and reactions. Perkin 3 in his work on morin in 
1896 assigned to it the constitutional formula of quercetin with 
the catechol nucleus replaced by a resorcinol group. This for¬ 
mula was verified by the work of Kostanecki 4 in 1904, and further 
‘Jr., Chim. Med., 6, p. 158. 
3 Jr. Chem. Soc., 67, p. 937. 
3 Jr. Chem. Soc., 69, p. 792; Chem. News., 73, p. 253. 
4 Ber., 37, p. 2350. 
