1. Brown, F. C., Bradsher, C. K., and Lawton, E. N., Ind. Eng. Chem., 45, 1027 (1953).
2. van der Kerk, G. J. M., van Os, H. C., de Vries, G., and Sijpestein, A. K., Meded. Landbouwhogeschool en Opzoekingsstass. Staat Gent, 18, 402 (1953).
3. Allan, F. J., and Allan, G. G., Rec. trav. chim., 78, 375 (1959), and references therein cited.
4. Allan, F. J., Allan, G. G., and Thomson, J. B., J. Org. Chem., 23, 122 (1958).
5. Allan, F. J., Allan, G. G., and Thomson, J. B., Can. J. Chem., 36, 1579 (1958).