... 3 Page 5. Nonadiazo Compound 259-264 Chem. Eur. J. 1996, 2, No. 3 0 VCH firlagsgesellschafi mbH, 0-69451 Weinheim. ... 263 nitrogen molecules from the diazo groups, two carbene centers might therefore be generated in close proximity and undergo facile recombination. ...