197375-51-2Relevant academic research and scientific papers
An unusual selective reduction of an oxime into an imine group in halogenomethyl rhodoximes
Steinborn, Dirk,Rausch, Mario,Bruhn, Clemens
, p. 191 - 197 (1998)
[Rh(dmgH)2(PPh3)]- ([Rh]-, 1) {[Rh]=[Rh(dmgH)2(PPh3)]; (dmgH)2=dimethylglyoxime}, obtained by reduction of [Rh]-Cl with NaBH4 in methanolic KOH, reacts with dihalogenomethanes CH2X2 (X=Br, Cl) to give besides the known complexes [Rh]-CH2X (X=Br, 2a; X=Cl, 2b) the complexes [Rh(CH2X){ON=C(Me)-C(Me)=NH}(dmgH)(PPh3)] (X=Br, 3a; X=Cl, 3b) where one oxime unit is reduced to an imine. Due to the strong alkaline medium (methanolic KOH) 3a was found to react partially, yielding [Rh(CH2OMe){ON=C(Me)-C(Me)=NH}(dmgH)(PPh3)] (3c). All three complexes were characterized by 1H-, 13C-, 31P-NMR spectroscopy. 3a crystallizes in the triclinic space group P1 with two molecules in the asymmetric unit. These molecules are linked via two N-HO hydrogen bridges forming a dimer. The rhodium atoms display a distorted octahedral coordination with the dmgH/ON=C(Me)-C(Me)=NH ligands in the equatorial plane and PPh3 and the CH2Br ligands in the axial positions.
