... a Ratio NBS to oxime was 2.5: 1. When NBS to oxime ratio is 1.1 : 1 yield is 22%; with ratio of 2: 1, yield is 58%. (1) Presented in part before the Division of Organic Chemistry of the American Chemical Society, Atlantic City, NJ, September 17, (2) DC Iffland, GX Criner, FJ Lotspeich, M. Koral, 2. B. (8) 0. Piloty and H. Steinbock, Be?., 81, 452 (1898). (4) C. Djerassi, Chrm. ... 2. Reaction temperature was 0-5'. (5) E. P. Kohler, THIS JOURNAL, 88, 887 (1916). ...