Org. Synth. 1931, 11, 52
DOI: 10.15227/orgsyn.011.0052
Submitted by E. J. Witzemann, Wm. Lloyd Evans, Henry Hass, and E. F. Schroeder.
Checked by Frank C. Whitmore and Harry T. Neher.
1. Procedure
In a 3-l. open flask, equipped with a mechanical stirrer and a thermometer and cooled in an ice bath, is placed a suspension of 65 g. (0.5 mole) of acrolein acetal (p. 17) in 600 cc. of water. The suspension is cooled to 5° (Note 1), and a solution of 80 g. (0.5 mole) of potassium permanganate in 1.5 l. of water is added, with stirring, at the rate of about 25 cc. per minute. The temperature is kept as near 5° as possible during the addition. Soon after the stirring is stopped, the mixture sets to a gel (Note 2). After standing for two hours, the mixture is heated for one hour on the steam bath and then filtered by suction on a 30-cm. Büchner funnel. The residual manganese dioxide is pressed thoroughly and washed with 150 cc. of cold water. The filtrate (about 2.3 l.) is kept cool and treated with 1.2 kg. of freshly dehydrated commercial potassium carbonate. The layers are separated and the water layer is extracted with four 100-cc. portions of ether. The ether extracts are added to the crude acetal layer, and the mixture, which may consist of two layers (Note 3), is dried over 10 g. of potassium carbonate. After removal of the ether, the residue is distilled under reduced pressure. The yield of product boiling at 120–121°/8 mm. is 55 g. (67 per cent of the theoretical amount).
2. Notes
1. The oxidation is very sensitive to changes in temperature. The best results are obtained at 5°; a slight variation causes a marked decrease in the yield.
2. If the mixture does not set to a gel, the yield is likely to be poor. This is usually due to poor temperature control.
3. Sometimes two layers appear at first, but these disappear when the potassium carbonate is added.
3. Discussion
dl-Glyceraldehyde acetal has been prepared by heating hydroxychloropropionaldehyde acetal with potassium carbonate solution;1 by treating glyceraldehyde with alcoholic hydrogen chloride;2 and by oxidation of acrolein acetal with potassium permanganate.3
This preparation is referenced from:

References and Notes
  1. Wohl, Ber. 31, 1799 (1898).
  2. Wohl and Neuberg, ibid. 33, 3103 (1900); Witzemann, J. Am. Chem. Soc. 36, 2229 (1914).
  3. Wohl, Ber. 31, 1799 (1898); Evans and Hass, J. Am. Chem. Soc. 48, 2706 (1926); Witzemann, ibid. 36, 1912 (1914); Spoehr and Young, Carnegie Inst. Washington Yearbook, 25, 177 (1925–1926); Expt. Sta. Record, 57, 817 (1927) [C. A. 22, 2368 (1928)]; Fischer and Baer, Helv. Chim. Acta 18, 516 (1935).

Chemical Abstracts Nomenclature (Collective Index Number);
(Registry Number)

potassium carbonate (584-08-7)

hydrogen chloride (7647-01-0)

ether (60-29-7)

potassium permanganate (7722-64-7)

manganese dioxide (1313-13-9)

Acrolein acetal

glyceraldehyde (56-82-6)

hydroxychloropropionaldehyde acetal

DL-Glyceraldehyde acetal