Abstract
Four kinds of acids generated by conceptual cleavage of a bond between C-1 and C-2 bond in 2, 2, 3, 3-tetramethylcyclopropanecarboxylic acid, the acid part of fenpropathrin, were prepared. Most of their esters with pyrethroidal alcohols did not show insecticidal activity. The insecticidally active esters of 2-isopropyl-3-methyl-3-butenoic acid (2), a type which is cleaved at the cyclopropane ring between C-2 and C-3 bond, with 3-phenoxybenzyl (a) and 5-benzyl-3-furylmethyl (b) alcohols, were converted to ethers and a hydrocarbon. The former showed insecticidal activity to brown planthoppers and green rice leafhoppers, and the latter to carmine mites, while the mother esters did not show the activity to any of these insects. When alcohol part a, b or c of the esters 2 was changed to 2, 4-, 2, 5- or 2, 6-dimethylbenzyl alcohol, the activity was relatively weaker than that of the mother esters.
