I1 example of the well-known I'aal-Iinorr synthesis. Other pyrroles IIIb-d were prepared similarly. Reactionof 2 mol of 1-Ne-TSC with the diketorie gives the bisthiosemicarbazone IVb (cf. ref 5). 4-Mono-substituted TSC's in general react in this may to give IVa-g, but we have so far been unable to prepare his derivatives from TSC's with other types of substitution.