Pyrrole-2-carboxaldehyde methylimine

Reaction between [W(RC=C)Cl(CO)2(py)2] (R = Ph, Me) with the anionic chelating Schiff base pyrrole-2-carboxaldehyde methylimine yields the cationic complexes [NEt4][W(RCCO)(NN)2(CO)] (where NN is the dianion of the pyrrole ligand). These complexes react with methyltriflate, forming the neutral acetylenic complexes [W(NN)2(CO)(RC=COMe)] (87OM1503). One of the pyrrolic Schiff bases is coordinated via the pyrrole and imino nitrogen atoms, and another one only via the imino nitrogen atom. 

In attempts to synthesize tungsten alkylidyne complexes containing chelating anionic donor ligands we investigated the reactions of the bis-pyridine-substituted complex 1 with dithiocarbamate ligands and with pyrrole-2-carboxaldehyde methylimine in the presence of... 

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