No abstract

The new coupling reaction of phenacylamines with silylstannane and lithium diisopropylamide (LDA) is reported. The treatment of a phenacylamine iodide 1 with (trimethylsilyl)tributylstannane (Me 3 SiSnBu 3 ) and cesium fluoride (CsF) gave a dimerization product 2 having no iodine atom. Reaction of 1 with LDA afforded a dimerization product 3 with an iodine atom. The products 2 and 3 were separated to the meso and racemic isomers, respectively.

No abstract

Insecticidal and antifeeding activities of a Bacillus thuringiensis product "Thuricide A" against the 3rd-to 6th-instar larvae of the gypsy moth, Porthetria dispar, were investigated under a laboratory condition. During the first several days following the ingestion of wild rose leaves treated with Thuricide A, the larvae showed a remarkable decreased appetite but the mortality was low. The mortality was gradually increased after 3 days until the 8th day after the ingestion of Thuricide A. The decreased appetite in feeding was observed from the 1st day, and did not recover so long as treated leaves were given successively. When treated leaves were changed with untreated ones on the 3rd day the recovery in larval appetite was observed. It could be considered that the antifeeding effect of Thuricide A is temporary. When the treated and untreated leaves were placed in the same cage and the larvae were placed on untreated leaves, almost all larvae did not move to the treated leaves. When larvae were placed on the treated leaves, however, they crawled about actively until some larvae reached untreated ones.

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