3, 6-Dichloropyridazine and 1-alkyl-3, 6-dichloropyridazinium cations react with pyrrolylmagnesium bromide to produce 3-chloro-6-(2-pyrrolyl) pyridazine. Further reaction with other nucleophiles is slow, but is enhanced by quaternisation of the 2-N atom. 3, 6-Di (2- pyrrolyl) pyridazine could not be obtained by this route.
