Abstract
Pyrazolinone Ring Closure with Alkoxy MigrationAlkyl 3‐(4‐nitro‐phenylazo)‐2‐brom‐2‐butenoates (1a, b) with morpholine undergo substitution of the bromo group and ring closure connected with a migration of the alkoxy group forming 4‐alkoxy‐3‐methyl‐4‐morpholino‐1‐(4‐nitro‐phenyl)pyrazolin‐5‐ones (2a, b).
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