Bioherbicidal Ionic Liquids

This study presents the properties of a new group of ionic liquids (ILs) based on various cations and pelargonic acid, a natural nonselective herbicide. The obtained bio-ILs were obtained with high yield (>92%) using a metathesis reaction or neutralization of quaternary ammonium hydroxides and characterized in terms of physicochemical properties. Tests under greenhouse conditions confirmed the superior herbicidal activity of ILs compared to pure pelargonic acid, especially against white mustard (5–10-fold higher efficacy of ILs). Further studies under field conditions revealed that tetrabutylammonium, benzalkonium, and oleyltrimethylammonium pelargonates exhibited the highest efficiency (50.5%, 49.5%, and 46.7%, respectively) at an approximately 3-fold lower dose of pelargonic acid (2.72 kg per 1 ha) compared to that used in commercial products (8–11 kg per 1 ha). This allows classification of the synthesized ILs as bioherbicidal ionic liquids (bio-HILs). In addition to bio-HILs, two new auxins were also ...

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