Avian Chemical Repellency: A Structure-Activity Approach and Implications
A phenyl ring with an electron donating or a basic group is central to repellency;
An electron withdrawing group in resonance with a basic group decreases the repellency (as well as the toxicity) of a substance. These effects are pronounced when the groups are ortho to one another;
The presence of an acidic group decreases repellency;
The presence of an H-bonded ring or a covalently bonded fused ring that possesses the required features (e.g., electron donating and withdrawing groups ortho to each other) can enhance repellency, but is not essential;
Steric hinderance can overpower the features described above, and can weaken the effectiveness of potentially aversive substances.
KeywordsPhenyl Ring Cinnamyl Alcohol Veratryl Alcohol Coniferyl Alcohol Vanillyl Alcohol
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