Reactions of aryl diazonium salts with formaldoxime and acetaldogime at room temperature gave p-acetylbenzaldehyde (la) (Yield 25%),p-acetaminobenzaldehyde (lb) (Yield 50%),p-Bromoacetophenone (1c) (Yield 60%),p-nitroacetophenone (1d) (Yield 64%),o-chlorobenzonitrile (2a) (Yield 50-57%) and 2, 4-dinitrobenzonitrile (2b) (Yield 54-64%).Reaction of p-acetaminobenzaldehyde (1b) with aminothiourea gave (TB1) (4c) Yield 90%,m.p.223-224℃.