Abstract
DR. G. M. BENNETT, in comments on a note on the above subject published in NATURE (Oct. 16, 1926, p. 555), questions the purity of the compounds of the type Br . C2H4(S . C2H4)nBr obtained by the interaction of dithioethylene glycol and ethylene dibromide. From a consideration of melting-points some of the lower homologues may be regarded as ‘impure,’ but it should be borne in mind that the presence of minute traces of impurities would raise or depress their melting-point, but all the same, analyses of the compounds would establish definite composition. This does not, however, apply to the case of Br . C2H4(S . C2H4)48Br. The preparation of this compound was repeated at least two dozen times under the experimental conditions detailed in the original paper, and the melting-point and analytical results agreed remarkably well. Moreover, it retained, even on crystallisation from molten naphthalene, the same melting-point and composition. These facts are sufficient to justify our claims to the purity of the compound. Further, the suggestion of Dr. Bennett that the compound might be contaminated with “substances some of which do not contain bromine,” is rather doubtful in view of the fact that nonbrominated substances could not be found after the disruption of the molecule by ethylene dibromide.
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RÂY, P. Lengthened Chain Compounds of Sulphur. Nature 119, 124 (1927). https://doi.org/10.1038/119124a0
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DOI: https://doi.org/10.1038/119124a0
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