INFRARED SPECTROSCOPY OF CHLOROPHYLL 41 



H,C-CH ^ CH, 



/K /\ /\ 



H,C-CI \ C 4C-C,H, 



\ I I / '' 



C N N C 



/ \ \ 



HC. Mq CH 



\ \ / 



"^l 1,0 d 



RjOOC-CHg Rg 



Compound Mg Ri R2 



Chlorophyll o + C20H39 — C<f 



^OCH, 



Pheophytin a — C20H39 — C<^ 



\OCHs 



Ethyl chlorophyUide a + C2H5 -C<^ 



X)CH, 



Ethyl pheophorbide a — C2H5 — C<f 



OCH, 



Pheophorbide a - H — C<^ 



\OCHs 

 Pyropheophorbide a — H H 



h Compounds of the b series same as above except for replacement of methyl 

 group in position 3 bv — Cw 



Bacteriochlorophyll* + C20H39 ■ — C<( 



\0— CH3 



Methyl bacteriochlorophyllide + CH3 — C<f 



\0— CH3 



* Differs from chlorophyll a by vinyl group in position 2 being replaced by 



— Q<C ) and the double bond A^'^ saturated. 

 \CH, 



Fig. 1. 



