hard, gray cake. The yield of crude product was 64.2 g. (0.42 mole), or 85% based on the isopropyl halides.The boiling points of a middle fraction of redistilled material at various pressures were obtained by distillation of a sample through a short Stedman column. The relation between temperature and pressure (in mm.) is given to within ±1.0 mm., which is within the accuracy of the measurements, by the equation log P -7.987 -1858/(/ + 230).Di-s-butylzinc.-By a procedure similar to that described above, di-i-butylzinc was prepared from 68.5 g. (0.5 mole) of i-butyl bromide, 92.0 g. (0.5 mole) of s-butyl iodide, and 140 g. (132 g. Zn, 2.0 g. atom) of zinc-copper couple. The starting temperature was 60°, and the reaction temperature 25°. The yield of crude product was 64.5 g. (0.36 mole), or 72%. On redistillation, the material distilled at 56°at 4 mm.Anal. Caled, for (C«H,)2Zn: Zn, 36.4. Found: Zn, 36.1.
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