PIGMENTS 



107 



"Dsters 



Chlorophyll a 



C 2 oH 39 



Gilorophyll 6 



Tribasic Isochlorophyllino Isochlorophyllinfi Chlorophyllina Chlorophyllini 



! (NHCO) 



Dibasic Cyanophyllin 

 acids Erythfojhyllm 



Monobasic 

 acids 



Neutral 



Kubiphyllin 



COOH 



COOH 



Glaucophyllin 

 Khodophyllin 



^ 

 MgGHN<; 



Pyrrophyllin 



aetiophyllin 

 to 



Decomposition of Chlorophylls by Acids. The first action of 

 dilute acids upon chlorophylls is to remove the magnesium, 

 without otherwise changing the molecule. Two hydrogens go 

 in in the place of the magnesium. Dilute acids act in precisely 

 the same way upon each of the " phyllins " shown in the above 

 scheme. In this way, a whole series of compounds, corresponding 

 to each of the chlorophylls and their alkali-decomposition products, 

 but with the magnesium lacking in each case, has been prepared. 

 Thus, 



Chlorophyll a, 



becomes Phaeopaytin a, 



/COO-C 2 oH 3 9 



