Synthetic pyrethoids

S. Gupta, S.K. Handa and K.K. Sharma, A new spray reagent for the detection of synthetic pyrethoids containing a nitrile group on thin-layer plates, Talanta, 45 (1998) 1111-1114. 

Thus Bottomly and Baker [133] have described a multi-residue method for the determination of organophosphorus and synthetic pyrethoid pesticides and carbaryl in grain. After extraction with acetone-methanol, the pesticides... 

Recoveries of organochlorine, organophosphorus and synthetic pyrethoids determined in barley and wheat were respectively 81-128% when present at the 0.04-0.05 mg/kg level, 70-129% when present at the 0.1-10mg/kg level and 63 -146% when present at the 1 p,/kg level. 

The recovery of the individual enantiomeric acids from the diastereomeric amides has not been carried out to any large extent, because of the inherent stability of the amide bond and the risk of racemization during hydrolysis. Jiang and Soderlund [62] reported the recovery of the individual enantiomers of 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid, a synthetic pyrethoid precursor, from its S( — )-(phenyl)ethylamide diastereomers by refluxing in 6 M hydrochloric acid at... 

Synthetic pyrethoids. These chemicals have a particularly high insecticidal power whilst generally being safe to hnmans and farm animals. They are efficient contact insecticides with a rapid knockdown action and some are thonght to act as antifeedants. These properties are seen as being valuable in the chemical control of plant viruses by controlling the insect vectors, e.g. cypermethrin and A-cyhalothrim... 

---