Action of grignard reagents on 6-(α-styryl)pyridazin-3(2H)-ones; synthesis of some 4-Substituted 6-(α-Styryl)-pyridazin-3(2H)-ones

6(α‐Styryl)pyridazin‐3(2H)‐ones (1a–e) reacted with phenylmagnesium bromide and/or methylmagnesium iodide to give the 1,4‐addition products, 4‐phenyl and/or 4‐methyl‐6‐(α‐styryl)pyridazin‐3(2H)‐ones (3a–e). The structures assigned to the products are established by electronic and infrared spectroscopy and by synthesis of authentic samples in most cases.