In our evolving studies on the chemistry of nonracemic a-and y-oxygenated allylic stannanes as reagents for Se2' additions to aldehydes, we found improved symanti diastereoselectivity for OTBS vs OMOM methallyl derivatives 3 and 4 (eq l).1
Residues of the acaricidal material 2,3-p-dioxanedithiol S,S-bis(0,0-diethyl phosphorodithioate) (Hercules AC-528) on navel oranges and lemons have been evaluated, using a semispecific colorimetric procedure. Half-life values for persisting residues of the acaricide on field-sprayed navel oranges and lemons were determined to be about 95 and 85 days, respectively. Less than 0.03 p.p.m. of this material was found in the edible portion of the fruit.
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