1-one and its N-phenyl derivative with substituted benzenediazonium tetrafluoroborates, and their 1H, 13C and 15N NMR spectra were measured and analysed. The active components react with enaminones in molar ratios of 2:1. Only in the case of 4-methoxybenzenediazonium tetrafluoroborate and 3-amino-5,5-dimethylcyclohex-2-en-1-one were traces of the product of the 1:1 reaction observed. The attack by