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|Title:||Studies on synthesis of various N-substituted derivatives with different heterocycles and their herbicidal activity|
|Authors:||Mashelkar, U C|
Tungare, Shefali S
|Keywords:||Coumarin 4-methyl acetates;Coumarin-4-methyl glyoxalates;SeO2|
|Abstract:||Coumarin 4-methyl acetates are oxidized to coumarin-4-methyl glyoxalate using SeO2. Unlike the oxidative decaboxylation observed in the case of coumarin-4-acetic acid, here the oxidation is very selective for active methylene group, without affecting the COOH group protected with ester function. The product thus formed is analogous to the phenyl glyoxalic acid methyl ester i.e. coumarin 4-methyl glyoxalate and can be a useful moiety for the various synthetic manipulations of heterocycles substituted at 4-position of the coumarin showing promising herbicidal activity. Different heterocycles substituted at 4-position of the coumarin moiety have been synthesized. The herbicidal activity of these compounds has been evaluated. Zea Mays and Green Gram have been used for pre-emergence and post-emergence screening of the herbicidal activity.|
|Appears in Collections:||IJC-B Vol.50B(03) [March 2011]|
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