102' 



COMPOUNDS AND 



[CH. 



Further, that the blue pigment of the flower is the potassium salt 

 of the purple, and the red acid salt, cyanidin chloride, depicted above, is 

 a so-called oxonium compound of the purple. 



Pelargonidin, moreover, has been prepared synthetically (Willstatter 

 and Zechmeister, 45). 



The above three pigments, either as glucosides or in the form of 

 methylated derivatives, are found in a number of plants which are listed 

 below (Willstatter, etc., 33-46). The sugar residues or methyl groups 

 may, of course, occupy different positions, thus giving rise to isomers : 



Callistephin 

 Pelargonin 



Pelargonidin. 



Monoglucoside of pelargonidin 

 Diglucoside of pelargonidin 



Flowers of Aster (Callistephus chinensis] 



Flowers of Scarlet Geranium (Pelargoniu 



zonale), pink var. of Cornflower (Centaure 



Cyanus} and certain vars. of Dahlia 



variabilis] 



Cyanidin. 



Asterin 



Chrysanthemin 

 Idaein 

 Cyanin 



Mekocyanin 

 Keracyanin 

 Peonin 



Monoglucoside of cyanidin 

 Monoglucoside of cyanidin 

 Monogalactoside of cyanidin 

 Diglucoside of cyanidin 



Diglucoside of cyanidin 

 Rhamnoglucoside of cyanidin 

 Diglucoside of peonidin (cyanidin 

 monoethyl ether) 



Flowers of Aster (Callistephus chinensis) 

 Flowers of Chrysanthemum (C. indicum] 

 Fruit of Cranberry ( Vaccinium Vitis-Idaea 

 Flowers of Cornflower (Centaurea Cyanus 



Rosa gallica and certain vars. of Dahl 



(D. variabilis} 



Flowers of Poppy (Papaver Rhoeas] 

 Fruit of Cherry (Prunus Cerasus) 

 Flowers of Paeony (Paeonia officinalis) 



Delphinidin. 



Violanin 

 Delphinin 



Ampelopsin 



Myrtillin 



Althaein 



Petunin 



Malvin 



Oenin 



Rhamnoglucoside of delphinidin 

 Diglucoside of delphinidin -f 



p-hydroxybenzoic acid 

 Monoglucoside of ampelopsidin 



(delphinidin monomethyl ether) 

 Monogalactoside of myrtillidin 



(delphinidin monomethyl ether) 

 Monoglucoside of myrtillidin 



Diglucoside of petunidin (delphi- 

 nidin monomethyl ether) 



Diglucoside of malvidin (delphi- 

 nidin dimethyl ether) 



Monoglucoside of oenidin (delphi- 

 nidin dimethyl ether) 



Flowers of Pansy ( Viola tricolor) 



Flowers of Larkspur (Delphinium consolida 



Fruit of Virginian Creeper (Ampelopsis quir 

 quefolia] 



Fruit of Bilberry ( Vaccinium Myrtillus) 



Flowers of deep purple var. of Hollyhoc 

 (Althaea rosea) 



Flowers of Petunia (P. violacea) 

 Flowers of Mallow (Malva 

 Fruit of Grape ( Vitis mnifera) 



