The l-4-bromo-5-trifluoromethylpyrrole-3-carbonitriles represent a new
class of insect control agents. The high insectidical activity observ
ed in this series prompted us to investigate the preparation of regioi
someric arylhalotrifluoromethylpyrrole carbonitriles. The synthesis an
d biological activity of eight of the twelve possible regioisomers are
described and discussed.