The addition of chlorine to benzene results in the formation of a mixture of isomeric forms of 1,2,3,4,5,6-hexachlorocyclohexane, as follows: CeHe + 3C12 ->• CgHeCle. The most recent article on this subject (11) describes four isomers, the alpha, beta, gamma, and delta, of a possible sixteen isomers that are proposed. The present paper is concerned with the isolation of the epsilon isomer from the chlorination process product, the physical and chemical properties of the new isomer, infrared absorption spectra,x-ray powder diffraction patterns, and solubility data. WHEN the known isomers of hexachlorocyclohexane• were being separated, it was noted that an impurity was present in some of the fractions. This impurity was first found in the infrared absorption curves and was called impurity A. A sample in which this impurity was especially strong was analyzed, and
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