t p/ghours 
Allethrin 2.0 
Dimethrin 3.6 
Phthalthrin 1.0 
Pyrethrin 0.2 3 
Photodecomposition of each of the four pyrethroids gave rise to twelve 
to sixteen products but little ester hydrolysis. Trans- and meso-cis~caronic 
acids were identified by co-chromatography (1638). 
CH, Pi Ox 
ad ty 
ook a es aie sv“ 
Guy Tues ci, ‘cH, 
' 
CH CH 0 
3, ip ~ “ 
aC -C Y-G-CH=G— GH- 
CH : -. MSOR MIT a ee CHS Wl ae 
\ off; CH3 
CH, CH, 
CH HOOC COOH 
3Nc=cH Le 
HOCH” ; 
CH, CH, 3 3 

0 teX 
CH, CH, ci, CH, 
CH 0 
3X0 7 
=CH -¢ 
HOOC” “OR 
ci, cH, 
37 
