RECENT DEVELOPMENTS IN ESSENTIAL OILS 323 (12) (13) (14) (15) (16) (17) (18) (19) (20) (21) (22) (23) (24) (25) (26) (27) (28) (29) (30) (31) (32) (33) (34) (35) (36) (37) (38) (39) (40) (41) (42) (43) (44) Barton, D. H. R., "The Stereochemistry of Santonin, fi-Santonin and Artemisin," 7. Org. Chem., 15, 466 (1950). Barton, D. H. R., Bruun, T., and Lindsey, A. S., "The Constitution of Caryophyllene," Chemistry & Induttry, 691 (1952). Barton, D. H. R., Bruun, T., and Lindsey, A. S., "Tricyclic Derivatives of CaryophyL lene," Ibid., 910 (1951). ' Barton, D. H. R., Bruun, T., and Lindsey, A. S., "Tricyclic Derivatives of Caryophyl- lene," 7. Chem. Soc., 2210 (1952). Barton, D. H. R., and Lindsey, A. S., "The Constitution of Caryophyllene," Chemistry & Industry, 313 (1951). Barton, D. H. R., and Lindsey, A. S., "Sesquiterpenoids. I. Evidence for a Nine- Membered Ring in Caryophyllene," 7. Chem. $oc., 2988 (1951): Barton, D. H. R., and Nickon, A., "The Absolute Configuration of Caryophyllene," Ibid., 4665 (1954). Barton, D. H. R., and Tarlton, E. J., "The Constitution of Carissone," Ibid., 3492 (1954). Batt, R. D., and Slater, S. N., "The Structure of v-Curcumene," Ibid., 838 (1949). Birch, A. J., Elliott, P., and Penfold, A. R., "Studies in Relation to Biosynthesis. Angustifolionol," dustralian 5 t. Chem., 7, 169 (1954). Birch, A. J., and Lahey, F. N., "The Structure of Aromadendrene. I," Ibid., 6, 379 (1953). Birch, A. J., Mostyn, K. M. C., and Penfold, A. R., "The Sesquiterpene Alcohols of Eucarya spicata Sprague and Summ.," Ibid., 6, 391 (1953). Birch, A. J., and Murray, A. R., "The Constitution of Lanceol," % Chem. $oc., 1888 (1951). Blumann, A., Cole, A. R. H., Thieberg, K. J. L., and White, D. E., "The Constitution of Globulol," Chemistry & Industry, 1426 (1954). British Standards Institute, London, "Methods of Testing Essential Oils," British Standards, 2073 (1954). Campbell, A., and Rydon, H. N., "The Synthesis of Caryophyllenic Acid," 7. Chem. Soc., 3002 (1953). •ekan, Z., Herout, V., and •orm, F., "A Chamazulene Precursor from Chamomile (Matricaria chamomilla L.)," Chemistry & Industry, 604 (1954). •ekan, Z., Herout, V., and •orm, F., "Isolation and Properties of the Pro-chamazulene from Matricaria chamomilla L., a Further Compound of the Guaianolide Group," Coll. Czech. Chem. Comm., 19, 798 (1954). fi. ts. A. Chiris, "Essence d'eucalyptus citriodora," Parrums France, •3, 72 (1925). Chopra, N.M., Cocker, W., Cross, B. E., Edward, J. T., Hayes, D. H., and Hutchison, H. P., "Constitution of •k-Santonin. Investigations Into the Position of the Double Bond," 5 e. Chem. $oc., 588 (1955). Clarke, P., "The Structure of Humulene, Chemistry & Industry, 661 (1954). Clarke, P., and Ramage, G. R., "The Structure of Some Derivatives of Humulene," 5 t. Chem. Soc., 4345 (1954). Clemo, G. R., and Harris, J. O., "The Structure of Humulene," Chemistry & Industry, 799 (1951). Clemo, G. R., and Harris, J. O., "The Chemistry of Humulene. II," 7. Chem. Soc., 665 (1952). Clemo, G. R., and McQuillin, F. J., "Synthesis in the Santonin Series. I. Some Oxida- tion Products of c•-(2-Keto-4-methylcyclohexyl)propionic Acid," Ibid., 3835 (1952). Clemo, G. R., and McQuillin, F. J., "Synthesis in the Santonin Series. II," Ibid., 3839 (1952). Cocker, W., "The Chemistry of •-Santonin," Chemistry & Industry, 19 (1955). Cocker, W., and Cahn, R. S., "Nomenclature of the Santonins," Ibid., 384 (1955). Cocker, W., Cross, B. E., and Hayes, D. H., "The Structure of•-Santonin: Position of the Double Bond," Ibid., 314 (1952). Cocker, W., and McMurray, T. B. H., "The Stereochemistry of Santonin," Ibid., 1199 (1954). Corbett, R. E., and Hanger, W. G., "The Structure of Metrosiderene," 7. Chem. Soc., 1179 (1954). Corey, E. J., "The Stereochemistry of Santonin, fi-Santonin, and Artemisin," 7- din. Chem. Soc., 77, 1044 (1955). Craig, L. C., in Weissberger, A., "Technique of Organic Chemistry," Vol. III, New York, Interscience Press (1950), pp. 171-311.

324 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (45) Dauben, W. G., and Hance, P. D., "The Position of the Double Bond in Pseudo- santonin," 7. atm. Chem. $oc., 75, 3352 (1953). (46) Dauben, W. G., and Hance, P. D., "The Structure off-Santonin," Ibid., 77, 606 (1955). (47) Dawson, T. L., Ramage, G. R., and Whitehead, R., "The Structure of Caryophyllene," Chemistry & Industry, 450 (1952). (48) Dawson, T. L., Ramag•, G. R., and Wilson, B., "The Structure of Caryophyllene," Ibid., 464 (1951). (49) Der, S., "Structure of Humulene," Current Sci. (India), 20, 296 (1951). (50) Djerassi, C., Rittel, W., Nussbaum, A. L., Donoran, F. W., and Herran, J., "The Constitution of Iresin. A New Fundamental Sesquiterpene Skeleton," •7. atm. Chem. Soc., 76, 6410 (1954). (51) Djerassi, C., Sengupta, P., Herran, J., and Walls, F., "The Isolation of Iresin, a New Sesquiterpene Lactone," Ibid., 76, 2966 (1954). (52) Dolej•, L., and •orm, F., "Synthesis of 2,8,8-Trimethylbicyclo-(5,2,0)nonane:a Proof of the Constitution of/•-Caryophyllene," Coll. Czech. Chem. Comm., 19, 559 (1954). (53) Eschenmoser, A., and Gunthard, H. H., "Zur Cyclisation des/•-Caryophyllens," Helv. Chim. atcta, 34, 2338 (1951). (54) Eschenmoser, A., and Schinz, H., "Zur Konstitution des Zingiberens," Ibid., :33, 171 (1950). (55) Eschenmoser, A., Schreiber, J., and Keller, W., "Zur Konstitution des Lanceols," Ibid., 34, 1667 (1951). (56) "Specifications and Standards," Essential Oil Association, Scientific Section, New York. (57) Fawcett, R. W., and Harris, J. O., "The Chemistry of Humulens. IV-V," •7. Chem. $oc., 2669, 2673 (1954). (58) Fawcett, R. W., and Harris, J. O., "The Structure of Humulene," Chemistry & Indus- try, 405 (1954). (59) Fawcett, R. W., and Harris, J. O., "Synthesis in the Humulene Series," Ibid., 18, 67 (1953). (60) Garcia de Nadal, N., "Chromatographic Separation of Terpenes, Sesquiterpenes, and Terpenoid Compounds," .4m. Perfumer Exxent. Oil Rev., 65, 17 (1955). (61) Geissman, T. A., "On the Structure of Eremophilone," 7. •lm. Chem. $oc., 75, 4008 (1953). (62) Glichitch, L. S., and Naves, Y. R., "Sur la Composition de l'essence d'ylang-ylang," Parfumx France, 10, 7, 41 (1932). (63) Gordon, M., "The Azulenes," Chem. Rev., 50, 127 (1952). (64) Guenther, E., "The Essential Oils," 6 vols., New York, D. Van Nostrand Co, Inc. (1948-1952). (65) Gunstone, F. D., and Heggie, R. M., "Experiments on the Synthesis of Santonin. I. The Preparation of the Lactone of a-(2-Hydroxy-3-Ketocydohexyl)propionic Acid," 7. Chem. $oc., 1354 (1952). (66) Gunstone, F. D., and Heggie, R. M., "Experiments on the Synthesis of Santonin. II. The Preparation of Compounds Containing the Dienone System Present in Santonin," Ibid., 1437 (1952). (67) Haagen-Smit, A. J., "Azulenes," in L. Zechmeister (Ed.), "Fortschritte der Chemie organischer Naturstoffe," Vol. V, Vienna, Springer-Verlag (1948), p. 40. (68) Haagen-Smit, A. J., "Sesquiterpenes and Direrpenes," in L. Zechmeister (Ed.), "Fort- schritte der Chemie organischer Naturstoffe," Vol. XII, Vienna, Springer-Verlag (1955). (69) Harris, C. M., and McKern, H. H. G., "A Note on the Occurrence of Guaiol in Some Essential Oils of Eucalyptus citriodora Hook.," in "Researches on Essential Oils of the Australian Flora" (Museum of Technology and Applied Science, Sydney), Vol. II (1950), p. 15. (70) Harris, J. O., "The Chemistry of Humulene. III," •7. Chem. $oc., 184 (1953). (71) Hellyer, R. O., and McKern, H. H. G., "The Essential Oil of Backhousia myrtifolia Hooker et Harvey. Single-tree Studies on Physiological Forms from Queensland," 7. Proc. Roy. Soc. New South Wales, 89 (1955). (72) Herout, V., Bene•ovfi, V., and Pliva, J., "The Sesquiterpenes of Ginger Oil," Coll. Czech. Chem. Comm., 18, 248 (1953). (In Russian.) (73) Herout, V., and Dimitrov, D. J., "Sesquiterpenic Hydrocarbons of Ylang-Ylang Oil," Chem. Listy, 46, 432 (1952). (74) Herout, V., Kolo•, T., and Pliva, J., "Sesquiterpenes of the Cadinene Type in Javanese Citronella," Ibid., 47, 440 (1953).