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Epoxyethers which contain two alkyl groups on the epoxide carbon atom were shown to react with Grignard reagents without rearrangement. From epoxyether I the methoxy alcohols III, IV, and V were prepared in about 75% yield using phenyl-, -naphthyl-, and p-tolylmagnesium bromide, respectively. The structures of III and V were proven by independent synthesis. Epoxyether II gave the methoxyalcohol VI, the structure of which was shown by degradation. The methoxyalcohols were characterized by pinacol rearrangements.One of the reactions studied early in the investigation of the chemistry of epoxyethers was the re-

This communication forms part of a continued investigation into the analytical applications of 2-pyridyl-2-thienyl-Z-ketoxime (PTK). This reagent has been used for the determination of trace amounts of cobalt 1-3, palladium ~, 5, platinum 6 and gold v.In the previous work concerning platinum 6, the reduction of Pt(IV) to Pt(II) by citrate and the subsequent chelation of Pt(II) with PTK required 20 hr of steam digestion. In the present work, iodide has been used to reduce Pt(IV)and a solution of arsenite is added to labilize the chloroplatinous acid for reaction with PTK. Under these conditions, chelation is complete within one hr of steam digestion. In addition, the tolerance towards some diverse ions is improved. ExperimentalApparatus A Beckman DB spectrophotometer and matched 4-cm quartz cells were used for all spectrophotometric measurements.Reagents 2-Pyridyl-2-thienyl-Z-ketoxime. The synthesis of this reagent was previously described 1. A 1% w/v solution in 95% ethanol was used in this study.Standard platinum solutions. A stock solution of platinum(II) chloride