Preparation of α-diazines and α-2-pyridylazines containing (1R)-(+)-camphor or (1R)-(–)-fenchone residues and their complexes with Group 6 metal carbonyls
作者:Bernard L. Shaw、Mark Thornton-Pett、Jonathan D. Vessey
DOI:10.1039/dt9940003597
日期:——
New 2,3,6,7-tetraaza-1,3,5,7-octatetraene (alpha-diazine) derivatives camph=N-N=CH-CH=N-N=camph II where camph is a (1R)-(+)-camphor residue, C10H16, and fench=N-N=CH-CH=N-N=fench II, where fench is a 1R-(-)-fenchone residue. C10H16, have been obtained together with the 2'-pyridyl derivatives camph=N-N=CHC5H4N III and fench=N-N=CHC5H4N IV. The configurations around the four C=N bonds of I or II are E.E.E.E whilst those around the two azine C=N bonds in III and IV are E,E. Complexes of the types [M(CO)(4)L] (M = Cr, Mo or W; L = I-IV), [Mo(CO)(3)LL'] (L = I, L' = NCMe, PPh(3) or AsPh(3); L = II-IV, L' = PPh(3)), [Mo(CO)(2)L(PPh(3))(2)] (L = III or IV) and [Mo(CO)2Br (eta(3)-CH2C H=CH2) L] (L = I, III or IV) containing these azines as ligands have also been obtained. Complexes of II arethe most unstable and these together.with tetracarbonyl complexes-of IV appear to show restricted rotation around the N-N bond(s) caused by the steric requirements of the methyl groups on the fenchone residue(s). All the complexes have been characterised by multinuclear NMR (H-1, C-13 and P-31), IR and UV/VIS spectroscopies and mass spectrometry. The crystal structures of camph=N-N=CH-CH=N-N=camph I and fench=N-N=CH C5H4N IV have been determined.