Organic Syntheses, Coll. Vol. 1, p.494 (1941); Vol. 8, p.102 (1928).
Submitted by Harold Hibbert and Pauline Burt.
Checked by Roger Adams and F. E. Kendall.
1. Procedure
Caution! Reactions and subsequent operations involving peracids and peroxy compounds should be run behind a safety shield. For relatively fast reactions, the rate of addition of the peroxy compound should be slow enough so that it reacts rapidly and no significant unreacted excess is allowed to build up. The reaction mixture should be stirred efficiently while the peroxy compound is being added, and cooling should generally be provided since many reactions of peroxy compounds are exothermic. New or unfamiliar reactions, particularly those run at elevated temperatures, should be run first on a small scale. Reaction products should never be recovered from the final reaction mixture by distillation until all residual active oxygen compounds (including unreacted peroxy compounds) have been destroyed. Decomposition of active oxygen compounds may be accomplished by the procedure described in Korach, M.; Nielsen, D. R.; Rideout, W. H. Org. Synth. 1962, 42, 50 (Org. Synth. 1973, Coll. Vol. 5, 414). [Note added January 2011].
To a solution of
42 g. (0.30 mole) of perbenzoic acid (p. 431) in
500 cc. of chloroform is added
30 g. (0.29 mole) of styrene (b.p.
141–143°)
(p. 440). The solution is kept at 0° for twenty-four hours and is shaken frequently during the first hour. At the end of twenty-four hours, titration of an aliquot part of the solution shows that only the slight excess of
perbenzoic acid remains
(Note 1).
The
benzoic acid is removed from the
chloroform solution by shaking with an excess of
10 per cent sodium hydroxide solution, the alkali is removed by washing with water, and the
chloroform solution is dried with anhydrous
sodium sulfate. It is then fractionated through an
efficient distilling column (p. 130). Removal of the
chloroform leaves a practically colorless liquid which distils at
188–192° (uncorr.)
(Note 2). The yield is
24–26 g. (
69–75 per cent of the theoretical amount).
2. Notes
2.
If the
styrene oxide is distilled over a free flame some decomposition takes place as indicated by the formation of water. This is not observed if the product is distilled from an
oil bath.
3. Discussion
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