The derivates of 1,2,4,3-triazaphospholes can exist in several different isomeric forms depending on the type of substitution. Forms 1 and 2 were prepared using methods described in the literature (1) (3) by action of hydrazine on imited where two forms of amidrazones A and B were obtained which react with tris (dimethyl-amino) phosphine to give an important quantity of 1 accompagned by quantity of 2 and some times only 1. In this work, we are describing a new method giving a better quantity of 2 and particulary when the type of substitutions were Ph. Ph. We acced to the diphenyl-1,5 triazaphosphole-1,2,4,3 which coudn't be obtained by Y. Charbonnel methods (1) (3). The 1,5 disubstituted-1,2,4,3-triazaphospholes react with organomagnesium halides like the 2,5 disubstituted homologues. We are giving here the results of this comparative study.
M. Haddad, M.T. Boisdon, J. Barrans