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Melting points were determined on a Fisher-Johns hot stage microscope, and are uncorrected. Microanalyses were performed by Dr. G. Weiler and Dr. F. B. Strauss, Oxford, England. Since the same procedure was often used to prepare several compounds, details are given below for representative experiments.Ethyl-ff-(l-nilrocyclohexyl)propionate (V). To a mechanically stirred solution of 129.2 g. (1.0 mole) of nitrocyclohexane, 50 ml. of ¿-butyl alcohol, and 12 g. of a 35% methanolic

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A two-dimensional Fourier analysis of the structure was carried out. It was complicated by a false solution in the early stages of the refinement and by difficulties in obtaining reliable intensity data.Despite the presence of the cyclopropane ring in the center of the long chain, the crystal structure is similar to that of the monoclinic normal long-chain fatty acids of comparable chain length. This is in direct contrast to the C19 acid with a methyl group substituted at the 9 position. The stereochemistry of the molecule is more complex than that of the normal straight-chain acids since the methylene groups along the chain are not all coplanar.