Methylenedioxyphenyl Compounds 
Piperonal 
Piperonal (I) was irradiated for periods of 1 - 24 hours when dry with 
a G.E. sunlamp (275W, peak absorbance 2967A). The exposure temperature was 
53°C. Using gas and paper chromatography, three compounds were resolved and 
identified: piperonylic acid (II), protocatechualdehyde (III) and proto- 
catechuic acid (IV). A dark brown product was also obtained from the re- 
action mixture, This was probably of a polymeric nature (458). When 
piperonal was fed to mice, piperonylic acid, N-piperonylglycine and two un- 
identified compounds were observed (755). 

OH Q 
{_n-cH,-U-on 
ve IT H5C 
| ; | 
no ¥ \ 
HO 0 0 ON oH 
| —" —_—_—_—_—- | Glycine conjugate 
HO 
HO 
EG. Iv 
Piperonyl Alcohol 
Piperonylic Acid 
Piperonylic acid was found after feeding the alcohol to mice. Free acid 
and the glycine conjugate were found after feeding either compound (755). 
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