An efficient diazo-transfer reaction of phenol is described. o-Quinone diazide (diazoquione) were synthesized from phenol by the diazo-transfer reaction using 2-azido-1,3-bis(2,6-diisopropylphenyl)imidazolium hexafluorophosphate (IPrAP), which is safe and stable crystalline, in MeOH in the presence of iPr2NH or DMAP. In addition, diazoquinones reacted with sodium azide smoothly in 2-methoxyethanol