brucination cycle applied to the +90.2°material gave 900 mg of volatiles (a^+68.9°) and from the brucine 340 mg (am +122.1°) of volatiles. A gas chromatographic analysis of this last fraction gave 95.3% 2,3-dibromobutane, 2.5% 2-bromo-2-butene, 0.6% diethyl ether, and 1.5% CFC13. Differential scanning calorimetry applied to this best fraction indicated the dextrorotatory component was 70% of this mixture, the remainder being d,l and the other listed contaminants.Registry No. (fi*,f?*)-(±)-2,3-Dibromobutane, 598-71-0; brucine, 357-57-3; 2-bromo-2-butene, 13294-71-8; (S,S)-(-)-2,3dibromobutane, 49623-63-4; (R,f?)-(+)-2,3-dibromobutane, 58560-19-3.
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