Cobalt metallacycles. Part 5. Synthesis of pyridines from nitriles and acetylenes via cobaltacyclopentadienes
- 1 January 1978
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 10,p. 1278-1282
- https://doi.org/10.1039/dt9780001278
Abstract
The complexes, [[graphic omitted]R4)(cp)(PPh3)](cp =η-cyclopentadienyl) react with nitriles to give highly substituted pyridines. When R4= CO2Me, nitrites react regioselectively such that the nitrogen atom in the resulting pyridine ring occupies a position away from the carbon to which the CO2Me is attached. The reaction with 2-methylacrylonitrile gives, beside the pyridine, a cyclohexadiene derivative and its complex. The complex [Co(cp)(PhC⋮CPh)(PPh3)] does not react with nitriles to form a nitrogen-containing cobalt metallacycle. The mechanism of the stoicheiometric and catalytic reaction is discussed.Keywords
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