1. Badings, H. T., Maarse, H., Kleipool, R. J. C., Tas, A. C., Neeter, R., Ten Noever de Brauw, M. C.: (a) Proc. of the CIVO-symposium on aroma research, 26th?29th of May 1975, Zeist, Netherlands; (b) Z. Lebensm. Unters.-Forsch. (in press)
2. Gershbein, L.L., Hurd, C.D.: J. Am. Chem. Soc.69, 241 (1947)
3. Asinger, F., Fischer, M.: J. Prakt. Chem. [4]35, 81 (1967)
4. Givaudan, Cie SA: Dutch Patent Appl. 7.302.718 of 10/16/73
5. Price, C. C., Snyder, W. H.: J. Org. Chem.27, 4639 (1962)