Transition Metal Complexes in Organic Synthesis. Part 57: Synthesis of 1-Azabuta-1,3-dienes and Application to Catalytic Complexation of Buta-1,3-dienes and Cycloalkadienes by the Tricarbonyliron Fragment

The 1-azabuta-1,3-dienes 5a–g were prepared and transformed to the corresponding tricarbonyliron complexes 6. The efficiency of 6 as tricarbonyliron transfer reagents and the activity of 5a–g for the catalytic complexation with either nonacarbonyldiiron or pentacarbonyliron was investigated. It was shown that the catalytic complexation with pentacarbonyliron using the azadiene 5b as catalyst in dioxane at reflux can be applied to 1-methoxycyclohexa-1,4-diene.