Syntheses and Plant Growth Retardant Activities of Trimethylammonium Compounds Containing a Terpenoid Moiety

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Abstract
To obtain new plant growth retardants, about fifteen trimethylammonium compounds were prepared from terpenoid aldehydes or ketones and were bioassayed. N, N, N-Trimethyl-1-methyl-3-(2', 6', 6'-trimethyl-2'-cyclohexen-1'-yl)-2-propenylammonium iodide (35), hitherto unknown, was the most effective growth retardant, the activity being far superior to that of AMO-1618.