Reactions between oximes and organo-derivatives of Group III elements. Part II. Pyridine-2-carbaldehyde oxime
- 1 January 1968
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 2618-2622
- https://doi.org/10.1039/j19680002618
Abstract
Pyridine-2-carbaldehyde oxime reacts with trimethylborane in toluene at 90° to form methane and the crystalline oximate (2-C4H3N)CH:NOBMe2, which is monomeric in benzene. The structure (IX) postulated for this derivative has the oximate residue in the anti-configuration attached to four-co-ordinate boron through the oxime oxygen and pyridine nitrogen. Alkyl groups are more readily cleaved from Me3Al, Et3Al, Me3Ga, Me3In, and Me3Tl by pyridine-2-carbaldehyde oxime at or below 0°, with formation of oximates [(2-C5H4N)CH:NOMR2]n, which are generally dimeric (n= 2) in benzene. 1H N.m.r. and i.r. spectroscopic data are presented in support of fused-ring structures (VIII) for these dimers, incorporating central ‘MONMON’ rings, with the oximate residues in the syn-configuration attached through oxygen to one metal atom, and through both nitrogen atoms to the other metal atom, of the dimer. The metal atoms are believed to be five-co-ordinate. Trimethylaluminium and syn-benzaldehyde oxime apparently form (PhCH:NOAlMe2)n.Keywords
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