1. a) For a comprehensive review and references of the above reagents for oxidations of hydrazones (1) to diazo compounds (7), see: (
2. b) Regitz, M.; Maas, G. Diazo Compounds: Properties and Synthesis; Academic Press: Orlando, FL, 1986; Chapter 8, pp. 233–256; (
3. c) Bösh, M.; Fink, J.; Heydt, H.; Wagner, O.; Regitz, M. Methoden Der Organischen Chemie (Houben–Weyl), Vol. E14B; Klaman, D.; Hagemann, H.; Eds.; Georg Thieme Verlag: New York, 1990; pp. 996–1010; and (
4. d) Holton, T. L.; Shechter, H. J. Org. Chem. 1995, 60, 4725.
5. The formation of diazoalkanes from the reaction of hydrazone anions with -toluenesulfonyl azide