In the presence of dichloro-bis(benzonitrile)palladium, azidoformate reacts with various unsaturatedethers to give 1-alkoxy-1-carboalkoxyiminoalkanes. Reaction with 1-methyl-2-propenyl ether was accompaied by methyl migration, giving 1-alkoxy-1-carboalkoxyimino-2-methylpropane.