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Contribution of Side Chains to Karbutilate Mode of Action

R. S. Hammerschlag, J. L. Hilton, P. G. Bartels and D. E. Moreland
Weed Science
Vol. 23, No. 5 (Sep., 1975), pp. 425-427
Stable URL: http://www.jstor.org/stable/4042351
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Contribution of Side Chains to Karbutilate Mode of Action
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Abstract

Inhibition of seedling growth and four assays for inhibition of photosynthesis were used to compare karbutilate [tert-butylcarbamic acid ester with 3-(m-hydroxyphenyl)-1,1-dimethylurea] with derivatives of karbutilate in which either the urea or carbamate side chain was missing. Karbutilate was a more potent, more presistent, and more specific inhibitor of photosynthesis than the phenylurea derivative fenuron (1,1-dimethyl-3-phenylurea) that would be formed by removal of the carbamate side chain. However, karbutilate did not exert the growth-inhibiting action observed for the alkyl carbamate derivative phenyl-N-tert-butylcarbamate, formed by removal of the urea side chain, which does not affect photosynthesis at concentrations below 10⁻³ M.

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