The structure assigned to the liquid nematocidal principle of Tagetes roots 5-(3-buten-1-ynyl)-2,2'-bithienyl (II), by Uhlenbroek and Bijloo, has been confirmed by studying the mass spectra and nuclear magnetic resonance spectra of (II) and its hydrogenation products. a-Terthienyl (I) and (II) have also been isolated from fresh roots of T. minuta (T. glandulifera).
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Horn et al. (1963) studied this question.