898 Wisconsin Academy of Sciences, Arts, and Letters. 
Chlorophyllid-a and chlorophyllid-b, heated with caustic alka¬ 
lies, after passing through a number of intermediate stages, both 
yield aetiophyllin, C 31 H 34 N 4 Mg, which appears to be the basic 
colored portion of the molecule. For aetiophyllin Willstaetter 
has suggested the following structural formula: 
CH 
-Ci 
■< 
I 
CH, 
CH 
\ 
N- 
CH = CH 
l l 
C- —C 
,< 
' e— 
/ S 
7" \ 
c — c 
Mg---| 
C ==.C 
I 
CH, 
\ / 
\ ' 
Referring aetiophyllin, as represented above, to the underly¬ 
ing hydrocarbon it is found to be derived from C 31 H 44 , a 
duodeactetrene derivative with six side chains, and falling un¬ 
der the formula of saturation C n H n2 - 18 as below. 
CHa—CH=C—C - CH — C- 
I I II 
CHa CHa CH 
I I 
CHa CHaCHaC 
II 
CHaC 
I 
CHa 
-C—CH - C—C = CH—CHa 
II I I 
CH CH2 CH3 
I I 
CH CHa 
II 
C— CHa 
I I 
HC=CH 
Aetiophyll itself is the product of the deammoniation and 
combination with magnesium, of a dec ami do substitution pro¬ 
duct of the above hydrocarbon. 
