1980 Volume 25 Issue 2 Pages 98-103
Thiocarbonyl amino acid derivatives [N-(4-chlorophenylthiocarbonyl) amino acids (PT) and N-(4-substituted benzylthiocarbonyl) amino acids (BT)] were examined on their herbicidal activities by pot tests (pre- and post-emergence application under submerged and upland conditions).
(1) Activity of PT was generally low and their activity persistence was short. In general, activity of free acid type compounds of amino acid residues was slightly inferior to that of methyl ester type compounds of the residues.
(2) Activity of BT was not associated with the kinds of amino acid residues and lower than that of PT. Activity variation which might be caused by the substituents (-Cl or -CH3) of the para-position of the benzyl groups was not almost observed.
(3) In the both lineage compounds, PT and BT, activity owing to the modification [-COR; R=-OH, -OCH3, -NH2, -NHC2H5 or -N(C2H5)2] of carboxyl groups of glycine and sarcosine residues decreased in the following order: -OCH3≥-OH≥-N(C2H5)2>-NHC2H5>-NH2.
(4) In the BT (amino acid residues: glycine or sarcosine), activity order caused by substitutions at the para-position of the benzyl groups was as follows: -Cl≥-NO2>-CH3>-OCH3>-H.
