1. J. Schmutz, F. Hunziker, andR. Hirt, Helv. chim. Acta40, 1189 (1957).
2. G. Büchi andE. W. Warnhoff, J. Am. chem. Soc.81, 4433 (1959).
3. For first paper seeB. Gilbert, L. D. Antonaccio, A. A. P. G. Archer, andC. Djerassi, Exper.16, 61 (1960). For most recent communication seeJ. M. Ferreira, B. Gilbert, R. J. Owellen, andC. Djerassi, Exper.19, 585 (1963).
4. J. A. Joule andC. Djerassi, J. chem. Soc., in press (1964).
5. Collected byA. Duarte and one of the authors (B.G.) in the Facenda da Mâe Dágua, Varzea da Palma Valley, Minas Gerais, through the cooperation of Dr.J. V. Goncalvez Pinto of the Belgo-Mineira Iron Company. This tree is used among others by the company for the production of charcoal.