Reactions of bis[(2,3,5,6-eta)-bicyclo[2.2.1]hepta-2,5-diene]bis(mu-chloro)dirhodium, [RhCl-(NBD)]2, with bis- and tris(azolyl)methanes have been performed in methanol and acetone with 1:1 and 1:2 [RhCl(NBD)]2/ligand molar ratios. The structures of the complexes have been characterized by infrared and H-1 and C-13 NMR spectroscopy as well as X-ray diffraction analysis. Cationic species have been evidenced in the solid state while equilibria between cationic and neutral species have been established in solution.
Reactivity of azoles towards benzaldehyde and its dimethylacetal. Synthesis of N,N'-diazolylphenylmethanes
作者:P. Ballesteros、J. Elguero、R.M. Claramunt
DOI:10.1016/s0040-4020(01)91435-8
日期:1985.1
Some 1,1'-diindazolylphenylmethanes have been prepared from indazoles and benzaldehyde in presence of zinc chloride as catalyst. The reaction was strongly dependent on the basic pKa 's of azoles and only few pyrazolyl derivatives could be prepared by this procedure. Extension of this method to other azoles was accomplished by using benzaldehyde dimethylacetal.