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Volume 44, 1911
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Analysis of Henpentecontyl Acetate.

Calc. for C53H106O2. Found.
C = 82·17 81·89
H = 13°69 13·57
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It is interesting to compare S. Kipping's figures* for the secondary alcohol and acetates produced from ketones lower in the series with the data for henpentecontane 26 Ol. and acetate.

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Acid. Ketone. Alcohol. Acetate. Difference, Alcohol and Acetate.
S. Kipping Lauric 69° 75–76° 34–35° 41°
S. Kipping Myristic 76–77° 80°5–81°5° 45–45°5° 35°
S. Kipping Palmitic 82–834° 84–85° 47–49° 36°5°
Stearic 88° 89°5°‡ 61°‡ 28.5°
Cerotic 93°† 97°† 60.5–61.5°† 36°†
Montanic 97.5°† 101°‡ 66°‡ 35†

Ethyl Cerotate.—This compound was prepared from cerotic acid by dissolving the acid in absolute alcohol and boiling for twenty-four hours with 5 per cent. sulphuric acid. The ester obtained by this process was carefully washed free from sulphuric acid, dried in a vacuum, and then distilled under reduced pressure. The distillate crystallized from alcohol in colourless plates. It is easily soluble in alcohol, motor spirit and ethyl acetate, and acetic acid.

It boiled at 285° (14 mm.) and melted at 58.5–59°, and further crystallization did not raise the melting-point. Beilstein gives 59–60° as the melting-point of ethyl cerotate.

The following is a comparison of the melting-points of montanic and cerotic acids, and the melting-points of their ethyl esters:—

Ethyl Ester. Difference.
Cerotic acid (78°) 58°5–59° 18°75°
Montanic acid (83°) 67° 16°

[Footnote] * Journ. Chem. Soc., 1893, p. 466.

[Footnote] ‡ Private communication, T. H. Easterfield and C. M. Taylor.

[Footnote] † Determinations by the author.

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