Refractive dispersion of organic compounds. Part IV.—Cyclohexene and 1 : 3-cyclohexadiene

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Abstract

In the present paper the measurements of the refractive dispersion of cyclo hexane and benzene, described in Parts II and III of the present series, have been supplemented by measurements of two intermediate hydrocarbons, namely, cyclo hexane and cyclo hexadiene. Data are therefore now available for the whole of the cyclic hydrocarbons of the series, C 6 H 6 , C 6 H 8 , C 6 H 10 , C 6 H 12 . It has, however, been possible to examine only one of the two isomeric forms of the hydrocarbon, C 6 H 8 , namely, the 1 : 3-diene, since the 1 : 4-diene has not yet been prepared sufficiently free from the 1 : 3-isomer to justify accurate physical measurements. The absorption spectra of the two unsaturated hydrocarbons have also been plotted and compared with those of benzene. Materials.—(a) Cyclohexene was prepared by the method of Zelinsky and Zelikow. Cyclohexanol (40 gm.) was heated at 100-110° C. under a reflux condenser for 24 hours with oxalic acid (200 gm.) previously dehydrated by heating at 120° C. for 12 hours in an air-oven. The cyclohexene was distilled from the solid mass and was fractionated over sodium. The fraction distilling at 83-84° was collected, kept over sodium, and refractionated immediately before use. The final product boiled at 83·1° C. and its density was d 20 4 = 0·8110, in agreement with the value 0·8111 interpolated from those given by Zellinski and Zelikow, d 27 4 = 0·8054, and by Auwers, d 15·1 4 = 0·8147, for specimens specially prepared for a similar purpose. Observations were also made with a sample of cyclohexene supplied by Dr. Waterman of Delft. The refractive indices of this sample were measured with an unmodified Pulfrich refractometer for 18 wave-lengths in the visible spectrum. The values thus obtained differ from those recorded for own specimen by an average of only ±0·0001, which is of the same order as the accuracy obtainable with the instrument as then used.

Publisher

The Royal Society

Subject

General Medicine

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