1. M. J. S. Dewar and P. M. Maitlis, J. Chem. Soc., 2521 (1957).
2. We are indebted to Dr. D. L. Tuleen Vanderbilt University for obtaining and interpreting the n.m.r. spectra. The spectra were obtained using a Varian A-60 Nuclear Magnetic Resonance Spectrometer. Methylene chloride was used as solvent. Chemical shifts are expressed as shielding values, τ. Infrared spectra were recorded on a P. E. Model 137 and Beckmann IR 10 spectrophotometers. All melting points are uncorrected. Analyses were by Galbraith Laboratories, Knoxville, Tennessee and Prof. Howell R. Clark, Murray State University. See reference 1 for the details of the method used in introducing chlorine and bromine into the reaction mixtures.
3. The values calculated for C9HsBrClN: Cl, 29.24. Found: Cl, 29.44 represent total halogen calculated as chlorine.
4. A. R. Osburn, K. Schofield and L. N. Short, J. Chem. Soc., 4191 (1956).