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Additional resources for Advanced Organic Synthesis. Methods and techniques
D. Kellert, and J. Sedlak, Org. Syn. Collective Vol. 4, 108 (1963). 10. H. J. Dauben and L. L. McCoy, /. Amer. Chem. Soc. 81, 5405 (1959). 11. H. O. House and H. W. Thompson, /. Org. Chem. 28, 360 (1963). 12. H. O. House and R. W. Bashe, /. Org. Chem. 30, 2942 (1965). 13. A. Butenandt and A. WoIfT, Chem. Ber. 68B, 2091 (1935). 14. M. Yanagita and K. Yamakawa, /. Org. Chem. 21, 500 (1956). 15. G. F. H. Green and A. G. Long, /. Chem. , p. 2532 (1961). 16. E. A. Fehnel, S. Goodyear, and J. Berkowitz, /.
1 g of benzoyl peroxide, and 50 ml of dry carbon tetrachloride. The flask is flushed with nitrogen and then refluxed for 40 minutes with IV. a-BROMINATION OF KETONES AND DEHYDROBROMINATION 49 stirring. The succinimide is removed by suction filtration and washed twice with 10-ml portions of carbon tetrachloride. The combined filtrate and washings are fractionally distilled at atmospheric pressure to remove the carbon tetrachloride and excess olefin (steam bath). The residue is distilled under vacuum, giving about 60 % yield of 3-bromocyclohexene, bp 68°/15 mm or 44°/2 mm.
C. trans-4-BROMOCYCLOHEXANOL (18) HBr /\^ ^^OH " Br, To 10 g of cyclohexane-l,4-oxide is added 48% aqueous hydrobromic acid (60 g). The phases are mixed thoroughly and allowed to stand at room temperature until the solution separates into two layers (usually 5 days). The mixture is saturated with sodium chloride and extracted twice with 25-ml portions of ether. The ether layer is washed with an equal volume of saturated sodium bicarbonate solution, then with the same amount of water. Finally, the ether solution is dried over anhydrous sodium sulfate, the ether is evaporated, and the residue is allowed to cool, whereupon crystallization should follow.