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By Richard S. Monson

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2. 3. 4. 5. 6. I. M. Downie, J. B. Holmes, and J. B. Lee, Chem. lnd. (London), p. 900 (1966). J. B. Lee and I. M. Downie, Tetrahedron 23, 359 (1967). A. W. Friederang and D. S. Tarbell, /. Org. Chem. 33, 3797 (1968). G. A. Wiley, R. L. Hershkowitz, B. M. Rein, and B. C. Chung, /. Amer. Chem. Soc. 86,964 (1964). D. Levy and R. Stevenson, J. Org. Chem. 30, 3469 (1965). J. P. Schaefer, J. G. Higgins, and P. K. Shenov, Org. Syn. 48, 51 (1968). REFERENCES 53 7. C. Djerassi, Chem. Rev. 43, 271 (1948); L.

2. -aminobenzoic acid, 200 ml of water, and 2 g of the catalyst is hydrogenated at 50 psi in a Parr apparatus. 6 mole of hydrogen), the mixture is filtered and concentrated under vacuum. When crystals start to form, the mixture is diluted with 200 ml of DMF and cooled in an ice bath. The crystals are collected by filtration, washed with DMF followed by methanol, and dried. s-4-ammocycloriexanecarboxylic acid, mp 292-296°, are obtained. 3. y-4-aminocyclohexanecarboxylic acid is mixed with 30 ml of Dowtherm At and heated rapidly to reflux in a flask fitted with a short distilling column.

REFERENCES 1. F. J. McQuillin, in A. , "Technique of Organic Chemistry," Vol. II. Wiley/Interscience, New York, 1963. 2a. P. N. " Academic Press, New York, 1967. 2b. P. von R. Schleyer, M. M. Donaldson, R. D. Nicholas, and C. Cupas, Org. Syn. 42, 8 (1962). 3. J. C. Sircar and A. I. Meyers, /. Org. Chem. 30, 3206 (1965). 4. D. S. Noyce, G. L. Woo, and B. R. Thomas, /. Org. Chem. 25, 260 (1960). 5. W. M. Pearlman, Org. Syn. 49, 75 (1969). 6. J. A. Osborn, F. H. Jardine, J. F. Young, and G. Wilkinson, /.

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