Investigations on nematicides: II. Structure of a second nematicidal principle isolated from Tagetes roots

A second nematicidal principle isolated from Tagetes roots has been identified as 5‐(3‐buten‐1‐ynyl)‐2.2′‐bithienyl. Upon catalytic hydrogenation 5‐butyl‐2.2′‐bithienyl was obtained which by comparison of infrared spectra proved to be identical with a synthetically prepared sample. The 5‐(3‐buten‐1‐ynyl)‐2,2′‐bithienyl was further characterized by its infrared absorption.