SYNTHESIS AND REACTIVITY OF A N-PYRROLYL BIS(IMINO)PYRIDINE COBALT COMPLEX

Abstract

The reduction and use of a N-Pyrrolyl-bis(imino)pyridine cobalt halide complex has been synthesized and evaluated as a catalyst for hydroboration and dehydrogenative silyation. The use of N-amino-pyrrole as bulky N-hetereocyclic groups is the key feature in this catalyst and is an interesting analogue to the well-studied Pyridine Diimine ligands comprising of aniline substituents. The synthesis of the N-amino-pyrrole starts with a Paal-Knorr condensation of acetonylacetone with acetylhydrazine. Condensation with the N-amino-pyrrole and 2,6-diacetylpyridine produced the ligand that was complexed to Cobalt dichloride. Reduction of the compound with Methyllithium afforded an active catalyst for the hydroboration and dehydrogenative silyation of a number of substrates.