From Acyl Complexes Generated by Other Methods

3 From Acyl Complexes Generated by Other Methods 

A further method for preparing acyl complexes consists in the treatment of alkyl complexes containing at least one carbonyl ligand with a strong ligand [44,105,106], Thereby 1,1-insertion of the carbonyl group into the metal-carbon bond can 

Acyl complexes can also result from the reaction of terminal alkynes with cationic, hydrated complexes of iron (Entry 4, Table 2.7) [47]. An electrophilic vinylidene complex is probably formed as intermediate this then reacts with water and tautomerizes to the acyl complex. 

Multicomponent condensations have also been described in these an isonitrile, a carbonyl compound and a suitable transition metal complex are combined in one step to afford heterocycloalkylidene complexes. Examples of the use of isolated or intermediate isonitrile complexes for the preparation of aminocarbene complexes are given in Table 2.4. 

Generation of aminocarbene complexes from metallates and carboxamides. 

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