1. E. Breuer, in: S. Patai (ed.), The Chemistry of Amino-, Nitroso-, and Nitrocompounds and Their Derivatives, Vol. 1, Interscience, Chichester/New York (1982), p. 500.
2. B. Princ and O. Exner, Coll. Czech. Chem. Commun., 44, No. 7, 2221?9 (1979).
3. H. G. Aurich, J. Engel, and M. Schmidt, Chem. Ber., 119, 18 (1986).
4. E. Bamberger and L. Rudolf, Ber., 40, 2236 (1907).
5. R. Foster, J. Iboll, and R. Nash, J. Chem. Soc., Chem. Commun., No. 22, 1414 (1968).